McDonalds serve raw chicken and refuse claim

On the 3rd February I went through McDonalds drive through and ordered a spicy chicken burger only after eating half the burger I realized the chicken was completely raw on the inside. I have a very weak stomach and was almost instantly ill. I tried to induce vomiting to avoid being sick but wasn't completely able to. Later that evening I had severe cramps and was violently ill I knew I didn't have salmonella as my son had it before and I never had the severe fever and pains he experience so I took medication and just made sure I brought everything up as quickly as possible but it took me at least 6 days to fully recover to my normal strength. I went to see the doctor who prescribed medication and diagnosed me with gastroenteritis. I took the raw burger back to Mcdonalds who lost the burger and tests could not be done they however passed my claim on to Proloss who requested all the information from me which I sent through only to receive a mail saying there is no link between my illness and McDonalds serving me a raw chicken burger !!!! This is after I told them I didn't eat anything else that day other than my normal breakfast at 7am. I haven't even had an apology from McDonalds