Mold and yogurt

Was eating a yogurt this morning and had a funny taste in my mouth, then found this. Wasn't sure what it was but it left a foul taste in my mouth for about 4 hours.
Complained to Muller and sent back the lid and the Foreign object and they confirmed the object was Mold.
They sent me £5 worth of vouchers as compensation but to be honest I haven't eaten a yogurt since so I don't think the compensation is any where near good enough