Poor service

I just tried calling MTN to find out why my billing is so much higher than expected. The lady assisting me kept putting me on hold for a total of 30min until I got cut off. Pathetic service and now to try and get through so many prompts just to talk to someone is ridiculous. All I want to know is why I am paying so much more than what the sales agent promised for a 2gig data contract with a tablet and insurance which should not have been more than R360 but is in actual fact closer to R500??? Pls MTN can you sort this out!!!<br>