Appalling and unfounded billing

<p> On 02 May 2015 I went to MTN store at Mall of Africa to take an additional MTN contract. I already had an MTN cell phone contract and this was an additional contract. I was helped by a guy called Patrick Jabulani Nkabinde. As we were busy with the application, I told him that he must set my subscriber usage limit to zero as with my cell phone contract. He confirmed that he set my limit to zero on the laptop contract of My MTNCHOICE 2GB@309. On the same day, I got an approval sms and went to the store to pick up and activate my new HP laptop. I further confirmed if Patrick has set my usage limit to zero and he assured me that he did. To my surprise, on the 7 May 2016, I got an sms saying I have exceeded my usage limit of R2,181 and my services were suspended. Perplexed and in despair, I went to the store to find out what was going on. Patrick assured me that it was MTN system glitch and he did something and my services were immediately restored. He further assured me that the usage limit is zero and mtn will only debit my R299 for my cellphone, R309 subscription for the laptop as well as the pro-rata of data provided. To my surprise, my account was debited with an amount of R2,400 on 31 May 2016. Can MTN sort this out? If Patrick did not set a limit to zero as instructed, then whose problem is it? I want my money and now!</p>