Personalized Upgrade offer - what a joke !!

I have received a personalized upgrade offer from MTN a week ago and has been trying to upgrade my contract (taking me nearly a week , and still not sorted). I went to the store, contacted the call center and retention department but no one can help me with the offer that I received FROM MTN!!!! This is called false advertising! MTN has the worst service and it just seems as if they are not interested in your business. REALLY BAD COMPANY AND THEY DO NOT KNOW HOW TO DO BUSINESS!!!