Bad service

Hi I am so sick and tired and frustrated for vumatel and supersonic that say I owe them money and they sending me sms and emails I do not owe them a cent I pay cash every 28 days at pik and pay I am not in arrears they need to really go find the proper people that owe them money because I know I pay my account it's really pathetic that they don't contact the right people that owe them money