Top tip!
If you don’t have a clear idea of what your choices are, or what a realistic outcome would be look up your rights or speak to an adviser. Don't just believe what you are told by someone who might not be on your side.
Be clear what you are asking for. Do you want an apology, a refund, compensation, or something else?
What your options are will depend on how strong your position is. For example, does the law protect you or will you have to rely on goodwill to get what you want?
It will also depend on how confident and motivated you feel. Sometimes it does not feel worth the hassle, and that can be a fair enough conclusion to come to once you have understood your options.
Even if the law does not protect you, it might still be worth having a go. If you negotiate confidently you may still get what you want.