The WORST service EVER!!!

i have been trying to convert my cell phone number *** from contract to pre-paid since November 2014. i have spoken to the call centre at least twice a month EVERY MONTH to be told that there is no \Notes"on there system that informed them of this change. In February i got hold of someone that told me i needed to pay a cancellation fee and send proof to \""Retention\"" which i did on the 28th February. I am still receiving my contract bill and when i called today they say there is no record of my payment made.<br> <br> What the hell do i have to do to be rid of this pathetic company??? Who do i need to talk to to get this sorted out"