eBay disabled CS phone service for cold calls in early 2020. Some inquiries on the help pages will present a call option and an access code.
Most issues can be solved without CS intervention and there is a wealth of experience on this forum if you want to post your questions here.
If you prefer to contact CS you can go through the help pages or use the chat option on the left side of this page:
https://www.ebay.com/help/contact_us?id=4002
You may have to go through several prompts to access a live agent.
