Nervous about the Mirena coil?

I had the coil fitted in june 09. Had the usual after effects I.E Varied bleeding, Cramps on n off for about 2 months. I then in dec 09 had some problems with server pains in my lower abdomen and went to the docs. Had a infection in my womb, Not the STI/STD type. The doc at the hospital recommended that i get the coil taken out as this could be causing the problem. It had slightly moved and therefore this could of been the reason i had the infection. I went to my local GP and they were very iffy about taking out the coil ( as it cost to much money to the NHS). I did have a course of anit-botics to sort out the infection which is gone now but the pain remains.

Do i have the right to demand it being taken out? Can they refuse to take it out? As i could be just going back onto the pill instead. Cheers Jess from South Wales, Uk.