Orders are always missing something

I have been ordering Burger King on either Uber eats or Mr Delivery for almost 2 years. There has yet to be one time that I have received the full order that I have placed. I have been in contact with their customer support who have basically told me to take it up with either Uber eats or Mr D.

To my knowledge, these companies pick up and order and delivery it to the end user. It is not their job to check that the order is correct. I have ordered from N1 city and Canal Walk on numerous occasions and the order has never once been 100% correct.

I have also gone to the new Burger King in Burgundy Estate and once I got home realised that that order too, was not correct. Today I ordered a family share bag and received no mayo, tomato sauce or even the x2 garlic dipping sauces that were supposed to come to with the meal (I paid for these sauces). This is really enough, I would rather order from Macdonalds, at least they always get my orders right! I would appreciate a response that doesn't include blaming the third party who are only doing the delivery.