I had order 1st item at 1,000 bht and then decide to order another items which is less than 500 bht but u have the fee of some 89 bht apply due to the second orders are not exceeding your requirement.
I think that is the ripped off.. u already have the customer record (which is about 10 min apart from 1st order) and why not u can combine 2 orders together. U want customers to surf your side for more attractive items but then you made it difficult for them to order. Another thing the discount code cannot apply to most of the products.
You can check my orders..Order number: 308748879.