Hollard cannot get my car insurance correct!!

I have two cars, both insured through GMSA Financial Serv. I receive a call two weeks back, that they would like proof of insurance to be sure the cars are still insured. I duly email details for both cars to them, and receive an acknowledgement thanking me for updating all the details. Two days ago i receive an SMS stating that they cannot locate proof of insurance for one of the cars, and that they are going to insure it themselves, pending my proof of insurance. I call them and the outcome is that they do in fact have my Proof of Insurance and they had made the mistake of not updating it correctly. I then receive an SMS stating that all is now in order. Not 30 minutes later I receive another SMS stating that despite all possible attempts to contact me (not one person from this company either emailed or phoned me...ever) have failed, and that they find the same car is still not insured, despite the 2 emails and telecom with them, and they are now going to insure it themselves...again!! I have instructed my bank to return any attempt by Hollard to load a debit order on my account. I would like a manager to call me, as the Call Centre is incapable of handling this simple request!