Hello sir i have made a claim but what will happen if i don't use this voucher?

$SOL

These are not free usdc at all. You are borrowing up to 50 USDC from Binance under their Cross Margin feature.
For 1 day only, no interest is charged (this is the “voucher” benefit).
After that 1-day reward period ends, interest starts accruing at the regular rate unless you repay the loan.
You must have sufficient collateral to borrow.
So think of the voucher as a short-term interest-free loan, not free money or a gift. If you don’t repay it within that one day, you start paying interest like any normal margin loan.$SUI