MTN ***USELESS**

So my account at mtn is more or less R450 per month on average. The month of august 2015 they sent me an invoice of R1100... i tried to phone them 4 times... i had to hold on for 45 minutes before someone helped me. Eventually i got through to someone who advise me to pay the account in full and they will investigate and refund me the balance... WHAT!!??? They added 4 x 500MB data bundles on my account which i never received. I requested 2 x 1Gb data bundles which they added on my account, but also added another 1Gb which i did not receive? So now what they are asking me is to pay for something i didnt get nor requested for them to take another 3 months to investigate... which in the mean time they want to cut my line because im behind on a payment??? Ive been with MTN for 5 years... the end of this year i will cancel my contract. Ive had enough of this ****!!! They can cut my line as much as they want and i refuse to pay them another cent!!! I will take my sim card to my nearest branch on monday then they can try and ***** someone who will fall for their ****!!