Bad service from Autopage

I have been with Nashua Mobile and unfortunately they have been taken over by Autopage. Since I have been with them I have been getting sms to tell me that I need to pay outstanding fees. Even though my account has been up to date and I do pay via debit order. Last week they have cut me off completely and no one can tell me why. So I have to spent loads of time on the phone to get someone to help me fix a problem that they have caused. My data bundle was only restored today. As soon as can I will go to a different provider.