Long-time landlord here.
For heaven’s sake, both landlords and tenants must put everything in writing. Verbal agreements mean nothing–and good thing too–since everyone remembers selectively.
Next time the other party promises something, hand over a pencil and paper and say “Here, give me a note to that effect”. Bingo. You have a contract.
Half the country’s lawyers would go broke. Judge Judy’s TV show would not exist.