Worst service ever

I have been sent bill's from ADT which are incorrect but can not get hold off anyone to assist me with the queries. I have sent several emails to the accounts departmen and to the sales peraon who i signed the contracr with but they never bother to reply to my emails. I have even sent an e-mail to the contact on the ADT website but haven't had a response.<br> <br> This is the worst service I have ever had.