Mcdonald's Bug in Salad

Hello,      On 12/11/14 I ordered a Mcdonald's salad and found a large dead g Grasshopper type insect in my salad.  I had already started to put dressing on the salad and had eaten the top layer.  I brought the salad back to the Manager who took the salad from me and had me write up a summary  Of the incident.  He gave me my money back for the salad in cash.  I did not seek medical Attention, nor did I get the salad back or the receipt back.  I did However take 3 pictures of the insect.  The Mcdonald's insurance  Adjuster called me and I relayed the story to him.  He asked me what I wanted and I said $1000.  He spoke to his side and then told me he could give me $100.   He emailed me a form releasing Mcdonald's from all legal claims and lawsuits Which I have not signed.  Do I have a case or should I simply ask  For more compensation?  Thank you. Ashley Samuel