Kellogg's Corn Flakes

I purchased a 500g box of Kellogg's Corn Flakes and was distressed to find a huge lump of a disgusting object (yet to be defined!) in the box.. I have been in email and telephonic contact with one of their customer care agents for 10 days, having sent photos, proof of purchase, proof of expiry date, etc. etc. I was promised that someone would collect the faulty product. I waited in the whole day, nobody arrived. I have been using Kellogg's over other name brands for decades, but this is the end!! I will NEVER purchase a Kellogg's product again. How shocking that nobody at the company seems interested or shows any assistance to see exactly what was in my product.