Terrible reception

I recently took a contract out from telkom mobile to use as a private number as I'm in retail, but I end up using my work phone now because the reception on my telkom phone is terrible. It's on roaming about 20 hours a day and the odd occasion that it is on, it's on EDGE. I was promised by the clerk when I took my contract out that my coverage would be good, but it turns out that I've wasted my time in taking a contract out to use as my private phone. Please resolve this urgently.