ADT Double billing and destroying my credit score!

I moved into a new house as a tennant and the alarm system contact person details, needed to be changed from the previous tennant to mine. The landlord is responsible for the payment of the service. ADT's rep then secretly signed me up as a new customer without telling me. He never asked for banking details and such so I naturally understood that this was to be just a transfer of contact details. As this was the understanding, they have now charged me for four months which I NEVER received an invoice for and then thery loaded four non payments onto my crediti score impacting my credit score severely. This is double invoicing for the same property!!!! They have not as yet removed the non payments from credit score and this complaint will remain here until such time that my credit score is clear again. Stay well away from this company as their admin side is useless!!! I feel like I was ******* and ****med. Horrible experience indeed.