dissaponting deals of mrpmobile

mrpmobile sold me a contract phone earlier this year. it worked for two months and just froze, until now it doesn't work. all they are good at is reminding you of your amount due but when you call there's no answer. I can't buy data anywhere- they are not on the Mr Price list so I have to wait for them to load my data. now I must pay more than R500 which I don't understand as they told me I do not have enough buying limit. I regret ever doing business with them