STOP *****ING FROM ME

I took out a contract 2 years ago (5gb data with a xbox) for R499 pm. I realised that the contract should have ended already. I phoned vodacom and they told me the contract is a 36 month contract. Impossible as i remember signing a 24 month contract. I have the original contract document with me and the contract stipulates 24 months.

Please contact me immediately in connection with this as no one seems to be able to assist me. This is not a 36 month contract and you trying to rip me off now.