Elle here from Shopify. Sorry you are having trouble contacting our support! For context, we've moved some phone conversations to online chats and email to help you faster.
When you are entering your store's URL, can you please ensure you're entering the correct .myshopify.com address? You can find the correct URL in your browser's address bar when inside your shop's admin.
To contact our support team, first head to this link here and log into your store. Once you've logged in, you'll be prompted to ask about a topic, like so:
Doing this will present you with links to relevant documentation on our Help Center, but there will also be an option to contact us directly if you require further help:
Clicking on this button at the bottom will then present you with the different support options available.
If you are still having trouble logging in after confirming your URL, you can choose the "Continue without logging in" option at the start and continue through the same process.
Hope this helps!