Unhappy client

I am not sure if I will ever be assisted by cell c regarding my previous report. I am writing again so that someone at cell c who wakes up in morning to do their job really really do their job to take my case seriously. This morning I received a bill from cell c of an upgrade that I didn't do which I have mentioned on the previous report. I called the retentions department to notify them and I was given two reference numbers ( ***) ( ***) . I am begging cell c to please sort out this matter seriously as it is stressing me and is exhausting. I have cancelled my contract with cell c as it was due for an upgrade on the 6th of May and I have sent an email to customer services and the retentions department.