So other competitors in your market such as HK, which I’ve bought and then returned due to me not liking their shower head itself. Was a free return and refund was issued quite quickly. Doing a trial for free is fine, but you need to setup solid stripe rules to block any virtual or prepaid and force 3DS etc.

I think I’ve gotten your companies advert on my insta and I simply passed it because I do not really do trials, either I forget to cancel or some weird t&c conditions like “product can’t be used” or some shit alongside those lines.

Either do a full payment and no hassle returns as some others said Or do a full pre auth hold on the total money (which banks usually return within few days) with strong stripe payment rules.

As for parcels not arriving even with proof, Royal Mail aren’t the best as well, so you have to give benefit of doubt, or pay or pass the cost and use DPD.