Unhappy with the service Mcdonald Midrand

Im very unhappy with the service i received at Mcdonald Midrand the manager is not helpful the gave me a order i did not request for the manager keeps on telling me to call a delivery service with my airtime while they are the ones who made a error i ordered a Ice cream with extras and the bring a order with a melted ice cream i requested to escalate the Manager Maggie did not guide me how to complain she was not helpful and its Like i was begging service for my money that time she needs that money for her salary