When clients claim you said something you didn’t

I sell a B2B service, I’m still relatively new to sales but not new to the industry I work in. (14+ years) I’m good at my job & have a great reputation.

Here the issue, once in a blue moon after a client launches they will claim I said something I absolutely did not. I’m an anxious person by nature so my response to these claims is extreme - I panic.

I want to be clear - I do not lie, I do not massage the truth & I am always completely honest, period. I couldn’t be shady even if I wanted to, my anxiety won’t let me.

Is this something that just comes with being a sales rep? If yes, any tips for preventing it?

It’s never been an issue professionally, it impacts me personally as the anxiety sits with me for weeks after the fact.