I feel very sad because I collected about 200 points in two and a half months of focus to get 2 USDC, but after I requested it, they gave me a deposit and purchase voucher, meaning that I need to buy USDC. Is this acceptable, and is it written in the reward voucher that it will grant you 2 USDC in your special funding wallet? After two and a half months of hard work, is this how the words can be manipulated? Please advise me on this, and thank you very much.