Landlord is insane and we need advice

Hey guys, any advice would help. We’ve been renting with cash, no written agreement for 7 months. It’s our first time renting so we didn’t know much regarding contracts we just assumed we’d get it but it never came, anyway we’ve been renting in cash, because the landlord wanted cash. Rent was originally €1100 with electricity and bins but he said to up it to €1200 to make up for extra heating costs during the winter. We’re in Ireland, we got caught in a snow storm and couldn’t get to our apartment but we left Februarys rent on the table for him (we’re always a month ahead to cover for any financial difficulty to give us a month to not worry about rent and figure stuff out) so we left Februarys rent on the table, 1.5 ft of snow we couldn’t get to our apartment. Our apartment isint insulated, it’s a converted garage. So he’s gotten 700 extra than the starting rent price to cover winter costs, he went in to collect Februarys rent and found the place was warm, he called us drunk at night and verbally abused us and insulted us screaming down the phone over the heating being left on even though they’re on a timer, our couch was damp, our mattress was damp so it definitely was not on and even if it was, it’s timed and he set the timer which he actually told us not to touch, so we didn’t. The heating has been untouched since we moved in. After he verbally abused us drunk we messaged his wife who is also our landlord and told her we would be out by the end of the month because we no longer feel safe after she messaged and apologised for his drunk mess and admitted he’s an asshole while drinking and he’s a bear with a short fuse, this made us feel unsettled living there so we started moving stuff right away, we asked for our deposit, and Februarys rent which is €2400 and now he’s saying we broke a bunch of rules. Like the cats we feed (no pets) but they were on his property and he said we could feed them because he feeds them. They didn’t go into the apartment. Then he said no children allowed was in the agreement (the agreement that doesn’t exist) because my sister stayed for 2 weeks with us (she’s 15) while my mom underwent cancer treatment. He’s trying to blame us for knocking a freaking pear tree which fell during a storm when we weren’t even there we were house sitting for my aunt. He suddenly has all of these issues because we want our February rent and our deposit back. His wife even told us not to move and that we were perfect tenants, after all of this back and forth of Blame happened with the landlord he then said he’s going to reduce our rent and get us a meter, he’s trying to lie through his teeth to say we broke all of these rules while at the same time asking us to stay and his wife telling us we’re perfect tenants. The apartment has always been spotless. My husband and I are clean freaks. Never had parties, never had loud noise, never had any issue with this landlord until he verbally abused us and suddenly there’s all these problems which we always asked permission for first, like my sister staying and the cats. Now he’s saying he’s not giving us the money because the electric bill will be high, even tho there’s an extra €700 to account for. He’s being so unreasonable and threatening court. What should we do? We have proof from messages of our rent being handed over, we have proof of renting from my withdrawal and messages, also proof of his wife apologising for the verbal abuse and asking us not to leave because we’re perfect tenants and then him trying to reduce our rent to make us stay after claiming we broke all of these rules. We are withered, he agreed to give us €2100 because we said look keep €300 to cover the extra heating and then he went back again and said he’ll see the bill and take it off, but I don’t think it’s very fair since we already have an extra €700 since moving in to cover heat during winter, which is what’s happening. Not to mention is it freezing in there. You can see your breath when breathing. What should we do? Any advice would help, there’s also a mountain of his dogs shit at our front door and his little dog attacks us when going to the bins. Any advice would help, thank you all.