Faulty device not refundable due to online shopping

I order a vape device online. I was going through one coil a week and I was only using the vape as a social thing at lunch times to chat to the smokers. The device was not used at all in the evenings or on weekends, it purely was a lunch time thing at work. After replacing the coil every week for three weeks running I started to think that the device was faulty. I tried for a week to get through by telephone to Vape King and eventually I got through and was told to send a email.. They refused to do a refund and said it is normal for one coil to be used a week. I did a lot of research and spoke to a lot of people who vape on a permanent basis and most of them went through one coil a month , some who did it for fun a coil lasted two months. I paid a lot of money for something that does not work correctly and it now costs me even more to replace coils every week :-( Not a happy :-( it is costly now!! If the shop was open I would of take it back the second week I had to put a new coil in!! Another company milking the gravy train.