brought go kart

I brought a go kart for my son this past x mas and had a problem with the battery in May. Was told you only have 7 day warranty on batteries. A lot of good that did since I got the kart in Nov didn't give it until x mas. So I buy another battery and still it wont hold a charge. Now I am being told that I have to pay someone to come look at it and then they will send the parts for the person to come back and I will have to pay him for two visits. I paid over 1200.00 for the kart and they give you no service. I would never use them again or recommend them to anyone