Chicken licken refuse to accept my mastercard

I am extremely upset, as I went into the branch today to purchase and wanted to pay with my Mastercard giftcard and they refuse to accept my Mastercard and the reason for this is that the funds take too long to settle into their account. this is completely unacceptable as they are not only in breach of the Mastercard T's and C's but turning customers away for invalid reasons, I will also be reporting this to Mastercard.<br>