New Lawnmower but not working

Bought a new tandem lawn mower electric 2200 watt on Thursday 3 of November 2017. I live in Potchefstroom but I had to go to Klerksdorp that was my nearest agencyTwo days later it was not working. I called the shop spoke to Quinton. He adviced me to open the electric motor to see if the electric wires are stil in place. I am not an electrician and the lawn mower is under guarantee, At the end the problem was in the hand switch. I was the mechanic Today Fourth of December it is not working again. I feel that the shop has the responsibity since they know that this is not the first time I am having trouble. The lawn mower is stil under guarantee Why do I have to take it to Klerksdorp on my expense? But the shop in Klerksdorp refuse to help me. I am retired and does not have unlimited funds. Actually I don't want this mower anymore!