Hi there @sonyam!
Don here from Shopify.
You can see various options for contacting our support team here on our support site.
When available, you will see the option to request a phone callback from our team among your choices there.
At all other times, each of the other options there will still be available.
We can also provide support here through the Community Forums, though some issues will be better dealt with in a live environment like a support chat.
All the best!