Unacceptable service

I have in my house an alarm system that has been unconnected since I moved into this house two and a half years ago. On the 16th of march I signed a contract for installation and reconnection. On the 9th of May finally a technician finally arrived and installed a sender unit. As there was no battery, he took his own battery with when he left. the next day I bought and connected connected a new battery. when I switched on the power, something blew in the control box and there was a smell of insulation burning. I informed the lady that sold me the contract ,and she promised that a technician will be sent out. At the time of first installation there was load-shedding so the unit could not be tested with power. Today, 8 days later I received a call informing me that a technician will be sent and I would be charged a call out fee. I find this totally unacceptable.