Kwality Walls
Its of hairr found in icecream

I bought qwality walls cup ice-cream from a store in Madambakkam, Chennai and found bits of hairs (looking like shaving cream with bits of hairs) in the icecream. I returned the ice-cream to the store ithing 10 minutes and the store keeper gave a refund.

Where should i lodge a complaint against this. The store keeper said they get it directly from the complany and there is no chance of dupicates. They asked me to provide a writted complaint. Will that work out?