Worst service ever from Cell C

Cell C has provided the worst customer service I have ever experienced in SA to date. Since being sold off from Greencom fibre to Cell C in June, we have been experiencing network issues and the inconvenience of being overbilled since then. We raised this concern at the end of March. We received no resolution or response in this regard and as such raised our concerns. This was met by confirmation from Greencom that requests have been sent to Cell C. This continued with no response from Cell C until 18th June when I had to contact one of the directors for Greencom. himself. He put me in contact with Dederick Venter Executive Head Broadband for Cell C. Dederick asked for time to investigate which was given to him. He rep**** by advising that we were incorrectly billed and our account was in fact in Credit. I then advised that I would like to terminate my subscription with Cell C due to this incident and the time that it had taken to be resolved, It was confirmed that our subscription would come to an end on the 30/6/2018 and that we would not be charged (as per email from Ashleigh). On the 6th July we received a statement. When we queried this we were advised that there is an outstanding amount. I then escalated this back to Wynand with the Executive Head's confirmation of the credit in our account. I have to date not received a response from Dederick or his team since. I have followed up on the 14th July and on the 16th July with no response. I have in these mails requested confirmation of a nil account and my cancellation. Nothing has been done. This is from the HEAD of Fibre within Cell C. If this is his attitude towards customer service then it is no wonder the rest of Cell C is so poor in this regard. I will not be paying a cent further and I want my cancellation proof confirming my credit balance!!!