Dishonest and Bad Service

bought a Genesus on black friday 2018. On using it for the first time, the unit got very hot and immediate took it back. they then told me its the motor. i waited just over a week for the unit. never used it again as i went away on holiday. in January i used it and the same thing happened. they took back the unit again after claiming that the motor was replaced the first time. again i waited just over a week and then they came back to me and told me that i can take a different unit and the price is more so u need to pay in. I told them i dont want to and I'll take a refund. i was then told i cant get a refund as they only do that within 15 days of purchase. i then told them its unecceptable as i never had an oppertunity to really use the unit and that it was the first time i heard of the 15 days policy and nowhere in the store or on my slip it states that. it's February already and up to now nobody contacted me, i dont have the unit and im out of my money.