Unknown or Unauthorised stop order

I have been trying to resolve my stop order that went through my payslip without my authorisation now I am being taken from pillar to post when I want them to reverse and stop this payment. I didn't take any new policy with Metropolitan now I will even close the investment I have with them as I can see that they can perform ********** activities and act as if they can't assist. I have logged a complaint on their website but no response as yet.