Pathetic service

I have been trying to query a billing issue since 7th of April. Cell C call centre staff are pathetic, they do not understand and follow instruction. I have logged the same query twice and was promised feedback both times and still haven't received any. no one is taking responsibility and is just passing the buck over to the next department who are just as useless and unhelpful. I'm tired of phoning and begging for assistance and repeating the same querying over and over. I have 2 reference numbers (one with the WRONG info *** logged as the agent was unable to follow instruction) and (another one that i'm still waiting for feedback *** which is also not the info I require) Cell C needs to train their staff to take instruction properly and follow up. This pathetic service is unacceptable. I asked to speak to the supervisor was on hold for a long time then the agent gave me a message from the supervisor. That is not what I asked for, again I asked to speak to the supervisor and again I had to hold. The supervisor wasn't helpful either and just said she'd get another department to contact me, which was already promised previously to me & again no contact was made.