Adt Protectron - Out of Business

Just called to have my system changed from Land line
to cell phone Was told by the salesman , it would be a matter of paying the additional 5.00 per month. I'm told now 288.00 and 10.00 extra per month for a "GSM". !!! Asked what "GSM" meant and he couldn't tell me.
Salesman stories and the office are not in sync. Will cancel contract