Tuff Shed Paid to have a shed installed and they did not do it. Ontario CA

I paid 3000 dollars to have a storage she dinstalled they said it would take them 8 weeks to come to do the install I paid 300 dollars to have the ground leveled before they showed up and when they got there they did not want to do the install claiming that the ground was not level but the worker was just being lazy and flat out did not want to do it. Then he tells me we have to pay another 250 dollars to reschedule for them to come back in 2 more months so at that point I told him I just want a refund for my money and he said no prblem but it will cost 15% which is 450 dollars this place is seriously a joke buyer beawre do not do business with this place you will surely be sorry.