Clawback Revenue

Good day Sir or madam.<br> I upgraded my contract from Samsung S3 Top up 200 (R368 pm) to a i3 Laptop with 1 gig data(R450 pm).<br> Soon after i took out the contract i realised that i have a bill for R2614. claiming that i need to pay a clawback revenue.<br> After calling the call centre about 5 different time and visiting one of their shop to enquire about this i where given different reason which all where incorrect.<br> One was that i downgraded from a higher package to a lower package(not correct) and other one was that i updated early. My update was done 15 march and was eligible from 7 january.<br> I emailed Call centre on the 17th and only got a reply yesterday 25th. When taking my laptop to mtn store i was told its too late to cancel. It does not state any where in my contract that i will need to pay a Clawback revenue and was not something i would ever have agreed on. I will get billed on the 28th and ill b every upset if the Clawback revenue gets debited!!!! please contact me to sort this out as it is something ill elevate if not resolve. I have all the necessary paper work to prove that a mistake was made