I totally sympathise with you, I had an absolute nightmare with them and only received my last issue a couple of weeks ago. I`m afraid you have got to keep phoning them because they are not very forthcoming when it comes to sending out missing issues. We had so many magazines not being sent it became confusing in the end to what we had and what was missing because they were not being sent in the right order. We have told them not to expect any custom from us again and they acted surprised!
Also keep on at them to cancel the direct debit, again something they are not so willing to do. We had everything written down with dates of when we received the magazines and the numerous phone calls and we could always stop them in there tracks when they contradicted what was said on the last phone call.
Unfortunately back in June we wanted our money back because like you we were so unhappy with the service and we were told that we would not get back our entire money. I think they would only refund the 3 previous issues or something along those lines so that is why we continued to persevere with it.
If it makes you feel better do a google search and you will find numerous complaints about the company so at least you know your not the only one.