Bad Customer service Bad

Customer service, BAD, no words t explain how bad. Call December, January, February, about billing on account , amount billed in 3 months FREE, period, Nobody can tell me why they bill me or for what for. Hold for 30 min, 45 min, today I use airtime for R100 today, my problem not resolved.. Out of desperation i pay the R68 rand, next, they cannot pick up the payment, request proof of payment, next ques what, they did not receive the proof of payment???