Do I follow the commands with my landlord for his convenience?

When we first moved into the home we signed a lease agreement and came to an understanding with his sister. After two weeks the original landlord stated we can’t pay the rent on the date stated on the agreement it would have to be on the 10th and it would be without any grace period. Another situation came up in regards to the boiler he left us without any hot water for 2 weeks and we was 4 days late. We asked for the total in late fees and he came up with a random number of $250. I reviewed the contract and it stated $50 after 12th then $10 each day after. I brought this up and again he declined this information. He stated the contract we have isn’t correct and that we need to write it on this contract and go based off what he says. I reviewed again the contract and it has his name and signature. No address to mail him any letters or forms