Upgrading but expected to pay Penalty fee

I am not happy with the service im receiving from MTN. First of all im due for an upgrade and received a email from MTN saying im due and i must upgrade my contract. So the loyal customer that i am did exactly that. I phoned in today to check my status on my upgrade only to find out that there is an Penalty fee for upgrading early. I dont understand how im at fault because MTN contacted me to upgrade. So they expect their clients to pay a fee to do business with them. I dont think that its fair. I have been a loyal customer to MTN since 2006. If this is how they want to do business then ill rather cancel my contract and go to another service provider.

If this is how they want to do business then at least tell people before hand before sending out mails telling their clients they are due for an upgrade.

Thanks, Melissa ***