FORCED TO USE CREDIT BALANCE - I WANT OPTIONS!!!!

Generally I LOVE Takealot. When I'm at Checkout and ready to pay - WHY WHY WHY am I not given the option of choosing how I'd like to pay? Be it using vouchers / credit card / COD. Why, if I have vouchers available, do I have NO OPTION but to use those vouchers? That's not right. Give me the option. I may be purchasing on someone else's behalf and want to use my credit card.