Lack of services

Since last year I was having bad service from FNB , it first started when I app**** for a phone and I signed to pay R399 per month. Months later they started debiting more then R399 and I complained and the consultant I spoke to said I will be refunded and I received nothing from them and they still charge me more then what the contract says. What I don't understand you can complain so many times and they tell you need to change the limit but I never increased the limit and they tell me they will change it from their side . How can I buy data almost every week and still be charge for out of data? My second problem with FNB is the lack of communication when you have money dispute on your account and they say it's your fault, I was charged by Uber twice and I got a communication from them that FNB is the one who was suppose to revise the money to my account and again I wanted to revise money bank to account that was not authorised by me and I still have not received any feedback . I have been emailing and calling but nothing . FNB is quick to overcharge people , they have lack of services and their consultants are rude and unprofessional.