Ridiculous Billing

During December MTN ran a promotion on 20 gig data for R199pm. For R50pm you could add a 4G router. The total R249.00pm. On the MTN app the bill so far amount is R1529.31. I went to the MTN store where a app**** for the deal and was told by the assistant manager that they have not loaded the discount yet and that the R1529.31 will be taken from my account and only then can I log a complaint whereby I will be given credit. This is totally ridiculous. This is the second MTN data contract that I app**** for and this is the second time that this has happened. I was forced to cancel the first contract after I was billed amounts over a R1000 for more than 6 months for a R99pm contract. After many hours on the phone and a whole day taken off from work it ended at the MTN head office in a big fight with MTN management who was only willing to give me credit. I am not willing to go through this again MTN you better come to the party I am about to take my business elsewhere.