Worst service ever!!!!!! 0 star rating.

If i could i would rate no start! They have been double debiting my account for 6 months. It's been a 3 minth headache to get this sorted and still no feedback. I'm at a point where i want to get my lawyers involved. I stopped my debit order and now i receive calls from them on a daily basis asking me to pay my account. I have a 12 month contract and they have been double debiting me for 6 months so in theory, my contract should be paid up. I have a legal binding contract with then but they dont seem to give a sh@#t! Maybe getting the lawyers involved is the best way to go about this.