Wrong store URL showing on Google

I have recently opened my store on Shopify through a website developer. Now all of a sudden while searching. Y website on Google along with my new store URL, my old discarded store link as @MyShopify .com is also showing.

When I click on this it redirects me to the original store but I do not want this link to appear on Google search.
my developer has been trying since yesterday and not able to answer me properly…. So I need to look for another expert?please help.

Google doesn’t pick up changes instantly and it can take days or even weeks for changes to reflect in the search.
While you can re-submit sitemaps and re-submit individual URLs to Google in the Search Console, it’s still up to Google to decide when search results will change.
If by “old discarded store link” you mean a different store, you will have to make sure the old store is shut down properly. Enabling password in that old store should do the trick.