MTN appalling agent service

I had a phone contract with MTN that ended month end of April. So because of the ridiculous data and minute charges mtn has I decided to end/cancel the contract and not let it go on a month to month basis. As I called in to cancel I spoke to a lady that advised me on an R89 sim only contract where I'd get 8gigs. 4gigs during the day and 4gigs at night. I told her I'd like to think about it coz I use minutes alot same as I use data so I wanted to shop around other networks. Called in a few days after that I spoke to a Guy called BANELE , who couldn't wait to get the sale. I told him I was in a bit of a hurry to go somewhere but he told me it'll only take a few moments and we'll be done. And surely so it did, I kept on emphasising on the 8gigs, 4 during the day and 4 at night he said YES! That's exactly what he's loading. Fast forward to this month I get a bill where I'm charged R121.93 for 2gigs and another R228.07 for an extra 2 gigs to make 4, instead of just R89. So I called in I've been transferred from pillar to post. Promised to be called and then nothing. On my last call I spoke to a gentleman called GORDON who I promised that I'll write a review on hellopeter and An email to head office should BANELE'S manager not call me back. So over the past couple of days I spoke to Melisizwe, Patience( who I was told was a manager), petunia from retentions and Luyanda from customer service. My reference numbers were ********** 80 and ********** 97. Such appalling service from MTN apart from ur ridiculous rates your agent's service which is just preposterous. If not called to rectify I'm taking this to further to Head office then to the Consumer protector.