Megan from mr delivery is a ****

Megan from mr delivery sends me an email Every day saying grab lunch and here's 30 rand off. why Is it then when I enter the coupon it says no sorry the coupon isn't valid for this restaurant. this is why South African run businesses die out because the whole point of getting food delivered is about convenience and frankly using mr delivery is frustrating. Surely these multi million Rand businesses are run by intelligent people. Just a quick update I used uber eats minutes later who offered the exact same deal and I ordered from the same restaurant no problem and received my coupon.