Poor technical service

In November 2014 we asked a sales person to come and assess our alarm system and give us a quotation. When the quotation came the amounts was different to that was discussed in person. On 8 January 2015 I met with another sales person with which I was very happy and signed a contract with him. He informed me that the technical team needs to come and install a new radio and a quick assessment of the system and it could take up to 10 days. They made an appointment with me for Friday 23 Jan after 15h30. They never pitched nor did I receive a call informing me they cant make it. On Mon 26 Jan I called them asking them what happened. We rescheduled for Tues 28 Jan after 17H30. Nobody pitched. Calling them the Wednesday morning they said that it was booked for that evening. I told them that I would not have booked the Wedn evening as I had a parents meeting. They told me that they will reschedule. Fri eve 30 Jan at 21h00 the technician called me to ask if he could come that Saturday on which I had to inform him no as I already had plans. Monday I had to reschedule again for Tuesday 3 Febr 17H30. Nobody pithced again. I called again today and still no one returned my call to reschedule