Bad Customer Experience - Makro and Trimtech

I purchased a Trimtech 140CC Lawn Mover and Ryobi Lawn mover on Jan 16th for my business from Makro woddmead. On feb 24th i opened the trimtech lawnmover box and want to test it as my business only start from 1st March 2016, we put the fuel and oil and started and with in 15 minutes the engine blown. i took it to makro and they said its unusual and they booked it fo assessment. on March 3rd i got a call from Trimtech and saying i didnt put enough oil thats the reason its blown and i must pay fro the engine replacement, but i put the oil as per their recommedantions. and i started using the other mechine and that one is fine. I told trimtech technicians i put the oil and when they not beliving me why should i believe them. I dont wanna deal with Trimtech as i bought the mechine from Makro. Makro must answer me <br>