MTN rips off customers by misleading them

Went to MTN Sandton City in July as I was due for an upgrade. I was on a package with substantive data. The salesperson assured me that I was switching to a better package - slightly less data but would cost me less. MTN made 4U XL. For the last 2 months my bill has literally doubled. Apparently there is a promo Fee for the phone I chose. Here again the salesperson assured me that with that package I could choose any phone at no extra charge. I’ve sent numerous emails to MTN asking them to explain my bills - the bills themselves make no sense AND my data is disappearing at an unbelievable rate. MTN has not bothered to respond to my detailed queries and request for the contract or explain why I was misled by the salesperson. I’ve been an MTN customer for 19 years. This has been the most disastrous experience. I regret walking into the store that day. Definitely time to move.