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I have a R 50.00 voucher with takealot. I am trying to purchase something online for R 199.00. When my sister tries on takealot for the same item, no voucher her first delivery is free. So she pays a total of R 199.00. When I try to purchase it, they give me a standard delivery of R 60.00 for the same day we both choose to deliver, they subtract my R 50.00 and I end up paying more? Voucher is a catch?