MTN MOST ANNOYING AND IRRITATING CELL PROVIDER EVER

Most irritating and annoying company EVER. After battling to actually do my upgrade for almost 2 months, now that the upgrade has been done, I am getting at least 8 phone calls from them wanting me to upgrade. The more I tell them I have ALREADY DONE my upgrade, the more frequently I am being contacted. This is now getting to a stage where I am thinking of going over to another service provider!!!!