Need Advice on Managing Startup Mentor Relation

I was I was introduced to a mentor, by my accelerator folks. I approached him for some sales lessons. The mentor turned out to be an asshole(I did not like him, the way he talked about stuff, and his approach to things in general. We had different approach, he was a street smart guy, and I have a far more academic approach to things). We had a minor, texting, where he went on to boast he earns 200 USD/hr and all, I did not like it. Said "Thank You, I have found better mentors who talk less BS and make more sense, been there done that kind of folks. Thanks for your time. Appreciate."

He went on to complain, to the accelerator folks. Now those guys, want me to patch things up. Because that mentor is an investor. And they do not want to ruin the relations of the organization with him.

The mentor has taken it on his ego. I have been told to manage this shit. I thought of sending an email. They say, come with something better. I don't know what, any suggestions?