Feeling disgusted

Last week I complained about edgars billing me for services that I did not use or agree to, which are cc chat airtime R78 and sms subscription 49,this have been going on for almost 2 years when I check my monthly statements, all this time I was not aware till last month, they told me they will investigate and get back to me and they did not bother. Today I went to Edgar's Greenstone mall and they called some department and I spoke to Bulelwa she told me they will investigate and get back to me, I did not take that because I have been waiting for their feedback already so I demanded to speak to her manager and she said he will call me back I asked for his name and she said it's Skhumbuzo Xoba, he did not bother to call me back. Edgars service is terrible, they taking advantage of their customers. This is my hard earned cash we talking about here. It's not the first time they do this the previous time they reversed all my monies and now they do the same thing again. just because the Edcon ship is sinking they are now resulting in *****ing from their customers. They messed with a wrong person now, I will teach them a lesson they will never forget.