In the case of a very minor injury we should at the very least be expecting a refund of the cost of the meal. If it was a more serious injury which necessitated treatment by a doctor or at a hospital casualty department then we would be looking at claim for compensation. Obviously the hotel will not make it easy, as you appear to be finding out. I would advise that you write to the organisation rather than telephone. Written complaints are taken more seriously and have to be dealt with.
Telephone calls disappear into the ether and can be forgotten or disputed.
If they do not respond to your letter, and you wish to take it further then talk to your solicitor. The hotel will take a solicitor's letter seriously.