Unhappy

You know what my problem is e everytime I order food in Debonairs and Fisher ways in mams mall and its delivered to my house,I have to argue with the delivery guys for a tip.on the advert you say Debonairs deliver for free but when they arrive at our houses they will say are giving me the tip or what?so I find it upsetting cause I used money to buy food then I have to add another R20 for them.and they make u think you are wrong for not giving them anything. So Debonairs must make it clear as to we pay for delivery or not.this is unprofessional really I feel abused