Refusing to give me service I am paying for

I bought a lounge suite with Ellerines on credit that had a 1 year warranty and a 2 year extended warranty. The lounge suite is financed by African Bank so when the shop closed down I continued paying African Bank. I submitted a warranty claim in June and they told me that the warranty has lapsed but by then I had forgotten about the extended warranty. I called them again after I revisited the contract and they are telling me that they cannot process my claim because there are no longer funds for extended warranties. This puzzles me because the extended warranty is included in the instalment that I am paying so I am basically paying for a service that I will never receive. Further more they are telling me that the closing date for warranty was 30th April but that information was never communicated with me. How was I supposed to know as a consumer if they didnt notify me? I am very disgruntled about the way that I am being treated by African Bank.