McDonald's always getting it wrong

When you call there delivery line to order they redirect you to there app. I placed an order on there app ***. When they deliver the guy gives me 1 cooldrink short then reads what food is supposedly in the bags which are sealed with stickers. What he said i was supposed to be getting was correct but when I opened the bags there was one burger short. Bit they gave me the chips for that meal so now I have paid for a cooldrink and a burger that I have not received. And unfortunately this is becoming a regular habit for McDonald's the last order we got from them they short delivered the toys for the happy meals then we promise ourselves we won't order from them again knowing that there is always a problem. But my kids really like McDonald's so then we try again and low and behold they disappoint us again. And they don't allow for any way to notify them that there is a problem. Or even contact them as the number listed on Google for them says this number does not exist the delivery number is automated and then cuts you off with no open but to contact the people that delivered the order. But Mc Donald's delivered the order and there is know what of contacting them. So this is now the final straw. There food is seriously not worth the constant headache of always being wrong . I have every intention on never getting anything from McDonald's ever again.