bad service

we recently bought a house in Springs, with the adt system , we had to take over from the previous owner, but the system is too old it giving us problems when we complain they say we must pay call out fee, of which I don't agree paying , we are new customers given new contract why not new system connected to our phones , the system is ****** old I won't renew this nonsense I have already changed 2 batteries Monthly Fidelity ADT Statement - BINDA, M A, MS (BIN00242)