Netstar worst choice ever

I have a Boomerang Product for my Guarding division and since Jan 20 the device does not work i send it back and was informed that it would be replaced the replacement only came late June 20 but my payment was made every month, we had a problem on my site and the Boomerang panic was used and no response was given i phoned Netstar and was told that i am on the system as a member that is why i was not phoned that to me is Bull as i am the owner and the only contact person i was then told that the system is ready and all is sorted 2 day's later we had another problem on site and was the panic used and this is more than a week ago still no help nor email or phone call from Netstar i spoke to the GM and was informed that the system will be sorted but from the last incident i send a letter to Netstar and to the GM stated that i am canceling my contract and would like a full refund from Jan 20 to date and then i will return the Boomerang device 1 week later still no contact i phoned the sales person that i cc into the email and was informed that they did not check the emails and will come back to me regarding and would everyone be informed to date still nothing this was just in short i will in my live not recommend netstar to anybody and will tell everybody that i know what bad service they give i do not want there service any more i want my refund and that is that