Waiting forever for a simple letter.

I used to be a customer of Auto and General for more than 10 years. We have now moved to the UK and need to get insurance here.

I have asked Auto and General for a letter stating that my wife had her car insured under my policy and that she has had no claims in over 5 years on her car.

It has been weeks and I am still waiting. Now the insurance in the UK wants to cancel our policy because they need the document.

I have emailed and emailed, again and again and still waiting. What else am I suppose to to?