Alan merrick

Hi everyone I bought a 2012 captiva 2.2 ltz 10 moths ago. I've not had any problems until one day while out I couldn't get it to start. I phoned the AA WHO informed me it was the starter motor. I took it to a garage where they change the starter motor. And found the new one burnt out. They couldn't figure it out. Then found that there's a problem from the battery cables to the starter motor and informed my car could of set on fire. I was wondering if anyone as had this problem.or information to help me It's becoming very expensive.