very bad and disgusting service i have ever had with a provider that i have been loyal to in 4 years

I have received a bill for December stating that I owe an amount of R2785.71, according to my understanding the previous contracts have been cancelled. This is what is going to happen if this is not sorted out by the end of this week, I will cancel all cell c debit orders and block the bank account number I have so that they don’t receive any payments from me until this whole mess is sorted out. I am now very much irritated by the manner I have been receiving from cell c. If this is how they operate I will stop paying and I don’t care if they list me. i dont want an agent to contact me, i want Mike Mwamba or Millicent Mnisi from TPHD to call me, and if they don't i am escalating this to the ombudsman and twitter with all the information that i have gathered under your incompetence.