<human>: Can you condense the text into three sentences or less?

Hey guys, Houston TX here. Question, last year my fiance and I rented an apartment with a pet addendum for a cat. We had to pay 300 USD total (fee and deposit) for her. We got another cat and the apartment complex says the total fees has jumped up to 500 total (fee and deposit). Now we looked up the new contract and it does state that those charges are in effect in October (the first is when it goes into effect). I know with rental contracts that the contract is valid as long as everything is followed exactly to the dot and is broken under certain situations. We had asked for the lease agreement a couple of months ago and they did not give us the pet addendum, so we used the new one to confirm that there is a part of the form that stated the costs tied to the animals.
<bot>: We are currently under the old contract right now until October. For paying fees and deposits for a second cat, do we follow our old contract or new contract?