Terrible experience - lost hope

We moved into a new property and transferred the account from previous owners to ourselves - all we needed was a change of ownership - after signing the contract and then moving in a tech came through to install a radio system, upon his visit we was informed that the current system was not up to scratch and needed to be replaced. My first question - how was Blue security then monitoring the property of the previous owners on the current system ? Why can you not help us set up the current system to fit our lifestyle ? I was now been quoted ridiculous amounts to have the whole system changed. This was infuriating on its own and what further added to my frustration was when trying to get info from the tech I was told to chat to the Rep - the Rep was also difficult at first get hold off. In my opinion there is no alignment between techs and reps, and I'm not totally convinced that either know what they are doing - also we was fitted with an incorrect radio system - which was picked up one month later - when I asked the tech why this is being changed now - he said he doesn't know he is just following instruction from the rep, and when I asked the Rep she said the tech made a mistake ??