Tesco policy

I bought an item that cost RM19.99 at Tesco. I wanted to pay with two RM10 vouchers. (for some time now, the smallest cash denomination in Malaysia is 5 sen) The first one passed, but the second voucher triggered an error becase the remaining price was less than RM10. Fine, I decided to use plastic. And then they charged RM10 to my card.

Oh, the irony...