Not willing to respond to my query/complaint

I contacted the Cell C call centre to raise a query regarding billing of my contract subscription. This was on the 21st Oct and as of today's date I have not received acknowledgment of whom will be looking into my complaint. I have contacted the call centre on 3 occasions prior and was promised that a supervisor would contact me but still waiting for this to happen, I have even asked what is their SLA and was assured a 2 day turnaround time which is not being met. The fact is that Cell C is advertising that they give superior service than other cellular providers and the consumer must give them a try, well Mr Jose Dos Santos I can assure you that I am no longer contemplating closing my subscription with Vodacom as your company is well below the industry standard for service. I thank you for helping me to make up my mind and staying put where I am. ALL I ASK THAT I CAN AT LEAST SPEAK TO SOMEONE ABOUT THIS CONTRACT I TOOK OUT 2 MONTHS AGO.