No service at Mtn

Very bad service!Actually no service.Paid R129 for 15G data Sim.Took Sim to store to rica.Asked them why there is no data on sim?They informed they don't not deal with any online orders.Where do you go to for any assistance?Emailed them and tried to call the customer care line 135 which is totally useless. As I look at all the negative reviews I'm sorry that I never did it before I bought anything from them and all I have is an empty simcard!