Complain about Telkom bad Service

I had a cell phone contract with Telkom for 2 years, my contract ended and I had it cancelled soon after that I app**** for a new contract was assisted by a lady called Zunicka at Westgate mall branch and requested to keep my old number which was now on prepaid, The lady at the branch advised it will be done by Monday as I got the new contract Friday. On Monday my number was still not done I went back to the branch and was promised it will be done the next business day. Then to my surprise the next day my number which was on prepaid was no longer working, no calls no smses came through not even bank notifications and OTP's. I called the contact centre and got told a request will be logged for the number change at that time my prepaid number was still reflecting on Telkom systems, I gave it two more days and mind you I'm still not receiving calls nor smses at the time. I called the contact centre again and to my surprise I'm told my number is no longer on Telkom's systems, so I asked the lady what she talking about cause I'm calling her from the same number I'm enquiring about she said no I'm calling from a totally different number, do I asked her to confirm the number I'm calling from and when she did I had no idea whose number that is or what its doing on my phone, cause the last I checked I was using my old number (prepaid one). So it seems to me Telkom gave me a completely new number instead of just changing my new contract number to the old number I had and now I'm still waiting to hear from them what's gonna happen cause I need my old number back as its linked to all my accounts and banking profile. I'm devastated and would really like to know how to go about resolving this cause I need my number back. Zunicka whom I believe is responsible for all this mess is now ignoring my emails, she's practically no longer replying. I have never received such bad service in my life, so if you ask me whether Telkom is the best network provider I'll definitely tell you now not to even think about it, they are the worst ever. And what irritates me more is that they seemingly do not have a complaints department line or I have searched online for it without any luck.