BAD service

On June 3rd, I purchased electricity and received additional tokens for a system update. However, I’m now left with R2900 worth of tokens that I can’t use because the system is rejecting them. I’ve tried entering them both before and after the update tokens, as instructed, but to no avail. Repeated attempts to reach Centlec or Mangaung for assistance have been met with either dropped calls upon being transferred to customer service or no response at all.