Disgusted

Bought a sharebox at the restaurant using their app on the 5 February 2018 at around about 14:30 my delivery was at my place, I took one of the burgers and gave it to my son as he was hungry after school and took mine put aside as I was going to eat it later and when I was about to eat it later I saw a dead worm in the burger then I tried to send an email to MacDonald as I couldn't call them cause I didn't know which restaurant it was that delivered my food as I didn't have the slip cause the driver that brought the food left my place with it, same night my son fell ill he started to complain about his tummy is painful then few minutes later he started vomiting it was around about 12midnight when he started feeling ill then around 2 he started to go to the toilet now he was vomiting on the other side he was busy sitting in the toilet, then he started to feel weak as he was losing to much water due to that vomiting I couldn't afford to take him to the doctor so we went to buy meds over the counter at clicks, I gave him the medication but he still couldn't keep anything down the whole day that day then he started to eat small amounts of food the following day, I tried to get hold of MacDonald and luckily I got them and found out which restaurant was that delivered as the where 2 MacDonald close to my house, the manager apologized and shifted the blame on their supplier for their carelessness and she transferred me to her boss and her boss only said he will refund me my money then try to send some form to their head office and they will get back to me till date (09/09/2018) I haven't heard from them now I am sitting here confused as to what else can I do or which other steps to takes cause I have been more than patient with them