Shockingly terrible customer experience

I recently purchased a meal from your restaurant but the quality of the food was terrible. The mash was spoilt and the chicken was very old stock. I got a reference from customer service to redeem a meal but the manager Jessica said that she could not help me and that customer service should not be assisting us with these complaints. I have now lost out on the food that we initially purchased and the petrol I used to mark he 2 trips to the restaurant and all my airtime to get the matter resolved. A big franchise as yourselves should never make promises to the customer if you cannot fulfill it