Terrible, Toxic Telkom!!!

Once again I find myself annoyed with the *********** staff of Telkom Pinecrest centre. I went into the centre this week to get a contract sum which costs R99. When everything was completed the Miss Mfeka tells me there is a sim charge of R209 for a R99 SIM. I get over this **** after being livid that I was not informed before. I get home log onto the app a day later when I inserted the SIM only to see that I have a R500 spend limit that I did not request at all. I did not request it and never have for as long as I have had any contracts whatsoever. I call to ask them at the call centre to reduce that limit to zero and I am told that they will only be able to do it in February. Why??? So that I can go above what my contact is for and have to pay even more for a lousy R99 SIM???? It seems that Telkom becomes more crazy each year and the most frustrating part it that when you try to escalate these matters no one bothers to respond or acknowledge you. Can someone please tell me if it is possible to cancel my contract with them as I think I have had about enough and maybe it is time to cut all ties my phone contract will soon be ending soon, maybe Vodacom will be a more viable and lucrative place to take my business.