Incorrect Invoice amount more than double

I have contacted ADT customer service and emailed every address I could get my hands on but still no assistance. Last year OCT we had renovations completed and asked for ADT to come quote on re-running the existing wires back onto the walls, these were removed to avoid them getting damaged.<br> <br> We were quoted R1140.28 and the end invoice came to R2533.08. If the cost was going to be higher we should have been given the choice to accept a new quote before any work is carried out.<br> <br> I have tried to contact someone at ADT since OCT last year. And sent another email to every ADT address on the 8th Jan this year.<br> <br> Now our account just for this job is overdue by 90 days because I refuse to pay over double for something I was not quoted on. Please rectify this amount to reflect the original quoted amounted and I will gladly pay that.