So first of all, I agree with Sibon, even if I sense it was sarcastic, at least she was upfront rather than trying to go through it whinging and giving as little service as possible. That's actually commendable.

2ndly, let's be honest. There's not really such a thing as a dick that's too big.

Women are pushing something with a 10cm end to end girth through that hole. It can handle girth if your gentle and slow. It may be the length she was worried about, but that's discussable. Hey punter, not too deep, otherwise my cervix will get injured ok? Translate if needed, and potentially have the shop keep an ear out for any signs of duress from the room if the punter didn't respect this.

In which case a friendly reminder behind the shop may be in order.

3rdly, don't know why you just left the room and didn't request someone else or ask the shop to accommodate you. That's their job. And why they have multiple girls on roster.

I've never had this situation but that to me is the logical steps to take.

Thank the girl and say I'm glad you were honest. Then go to the shop and say this girl didn't want me, not sure why. Please confirm why, then ask the other girls if there is someone willing and I will choose someone else. If the reason is something where no other girl will accept (i.e WL saw you clearly had herpes on your dick when you didn't notice) ok I'll take my business elsewhere. (And get a bloody checkup).