Trying to upgrade

MTN has got to have given me the worst service I have ever received. After our contract was taken over by MTN from Nashua Mobile, we tried to upgrade our phone. Every number I dial is the wrong number even when I am given the supposeded right number. Then when it finally seems as though our application is going through I get told there are no details for our business on the system and that I need to call them in. I call in - get put through numerous times to the wrong department - and get told that I need to email it through and that this process with take 72 hours. I am still no closer to get my contract sorted out and everytime I call your 809 number I get cut off before even getting a chance to speak to a human.