Car Magazine never delivered!!!

I have subscribed with magsathome (Car magazine) at the end of December. Every single month we have to phone because the mag is not delivered! Once it came 2 months later.... For the rest.... It is never delivered!! One time the supervisor promised to find out why the magazines are not delivered, also promised to phone back... Never happened. Phoned now again, the agent could be of any service and the slammed the phone down after we wanted to speak to a supervisor or manager. Trying to phone again but no answer.. This is beyond pathetic. I want a refund on all magazines that have been paid for!!!!!