MTN ******** me after 8 years with them

been with them for 8 years and never had an issue till now. they called me november to upgrade my contract. they said everything was in order and that they going to do that and that id save money, my bill they said would come out to R1000 for my 2 contracts. this month my number is disabled as i somehow have to pay R3000, so apparently they haven't upgraded my contracts, instead they cancel it without me knowing and 1 contract has been in pending status regarding the upgrade???? So whats the deal MTN is this how you treat long time customers by ******** then charging them 3 times the amount. So either fix this or I will be moving to another provider you have 2 days