This is a perfect example of why you should get everything in writing. The lease you have with him is written, states a lease rate and more than likely legally binding. If you owe the money, which you acknowledge you do, you are in default of the lease and he has the option of evicting you. Just like somebody that doesn't pay their mortgage for whatever personal reason. If you are in default of a written contract, you lose.
Mar 5, 2012