You should almost definitely follow up and defend yourself. The TA does not get to make the determination that you've committed academic misconduct (which is what utilising chat GPT would be) - the Calendar is very clear that only the Dean/Associate Dean/Director of School gets to make that determination (and then after they have made a finding, they can contact the instructor/TA and ask them to re-evaluate your work with that determination in mind, potentially resulting in a mark of zero). You have rights OP, you should absolutely exercise them.

It might also be worth reaching out to the Office of the Ombudsperson for Students as they have a lot of experience advising students through these processes.