Poor customer service from Makro

I purchased a trimtech from Makro pmb in February 2018. December 2018 the trimtech stopped working. Been under warranty i sent it in for repairs. Weeks later i get told that i have to pay for the repair because the repair because apparently water went into it. So i asked them a very simple question, "Does grass have moisture in them", they reply was 'YES'. So i asked them how is it my fault that water went in it. The purpose of the trimtech was to trim the grass so that what is is used for. Was i suppose to put the heater on for the grass because i cut it? I expect the unit to be repaired but guess what they havent done so