Poor service & poor quality product

I bought a trimtech lawnmower from makro in Dec 2013, after 15 minutes of use the motor seized. I returned it & got a replacement. November 2014 the motor seized again & it was repaired under warranty. 2 hours of use & motor seized again - back for repairs now they want to charge me for a capacitor, claiming this is now the fault & the motor was replaced during November repairs. Unless they replaced it with a 2nd hand motor they are lying. And only good reason for capacitor to overheat & fail would be due to a seized motor. Only money back & a different brand of mower will fix this!