MTN have suspended and the worst service provider ever

MTN have suspended me. They have suspended me because I didn't pay my account.but my biggest problem I dont want to because I must pay more on a contract that I was signing for R300 now paying R900. Trade in a old phone and they said on the booklet R300 a month and on the contract that I have signed. So are they ****ming people like this?I have been 4 times to MTN have wrote emais to them even phoned them nothing is getting resolved😡