Data Contract

Good Day I have a contract with Mtn (Data) i am Currently paying R335 for 10 Gig day and night ,Last month I called them telling them that I can no longer afford to pay this as I am not working .I wanted to cancel the contract with them ,they said I will have to pay around R2000 to for cancellation .I asked to make an arrangement on how to pay this money as I am not working ,they refused .I told them to stop loading the sim card with Data but they won’t stop . I cannot continue paying because I don’t afford it anymore ,and if I reverse the funds it’s gonna dent my credit score ...i am not happy with your service ... My number is ***