how do I reset my alarm?

Hi, I had some new windows and a door put in yesterday and the fitter has had to remove the sensors and reattach them. My alarm is now not working and i cannot imput my code, the keypads dont bleep & tamper light is on, can anyone advise what I need to do. If you can call me on 07891339949 or give me your tel number and I will call you. I would be eternally grateful!!!!!