Worst Service Ever

I bought a new car and phoned in to put it on my insurance and have my old car removed. My old car has still not been removed after nearly 4 months.<br> <br> I have already phoned them 4 times already to cancel my old car and stop deducting both premiums from my pension but still nothing has been done. <br> <br> They said they were going to stop my old car and refund my money, but nothing has been done. This is really frustrating and the worst service I have ever had which is taking the little pension that I have