Bad service

I brought a secondhand vehicle with a Chase tracking unit fitted in the vehicle and took the contract over in May 2015.<br> They got all my details and was suppose to have a debit order in place. In July 2015 they phone me to inform me that my account was in arrears. Since then I send e-mails and phone them to get their banking details so I can pay them, up to now NO LUCK just empty promises! I requested a invoice and that also was just a empty promise. I can't carry on like this! They tell you that they will send you their banking detail by sms and still nothing. I rather make use of a company that I can trust.