A&E doesn't stand by their repairs

We had the spring on our microwave door repaired 12/21 by A&E in Sterling Heights MI.  They replaced the spring for $129 and $43.  TWO weeks later, the spring broke again.  Because of holidays and busy schedules, we didn't get around to calling A&# until 2/24.  By that point, they said they would charge us for a new visit and spring.  They said their work was guaranteed only  for 90 days and we were at day 92!!