Hi I sold a smart watch and before I excepted his offer I messaged him to say that I'm not sure if it works or not and they said OK just send it, they received it on 4th March they then sent me a message saying it dosent work which I explained to them stating that I did message them saying I'm not sure if it works or not, fast forward to today I now got a return on said item saying it is now a fake smart watch do I just refund him?  In my discription I just said smart watch not a specific make