what should i have done in this situation?

[Aoi Magi]

In these situations I'd stick to what my parents have taught me, don't be afraid if you have done nothing wrong! I know it can get awkward but you already did the right thing by sticking up for yourself, so don't fret over it too much. She could've just been senile or a con-artist but whatever the case, you didn't do anything disrestpectful and held your own, that's more than what most would do in your situation