MTN such a disappointment

I recently upgraded one of my cell numbers and I was assured by the consultant I would pay R220 per month, it would just be my first month where I would pay R260 as it is pro rata charges etc. But now it seems to be increasing and I checked MTN's website to check the charges and it also states that the monthly charges will be R220. This is a top up contract so there should be no extra charges also there are no contact charges. I currently have 2 more numbers due for an upgrade but I am very unhappy with MTN and there "marketing" and help centre so I am just waiting to cancel both my lines.