Julie here from Shopify Support. Thanks for reaching out.
We recently changed our support setup and this involved replacing our phone number with a callback system, as merchants were subject to prolonged wait times while on hold.
If you'd like to request a callback, you can do so through our support page once you enter a search term in the "Ask about a topic" field. Keep in mind that there may be times of the day where the callback option is not available due to high support volume.
If this is the case, you can also reach out to our 24/7 support team via live chat, email, and social media. Those contact methods can be found from the same page.
That being said, feel free to share your question here! I'm happy to help.