Hi RoshanRR,
If you'd like to export your contacts, these steps might help.
Export a vCard
1. In Contacts on iCloud.com, select one or more contacts in the contacts list.
2. Click in the sidebar, then choose Export vCard.
3. If you select multiple contacts, Contacts exports a single vCard containing all of them.
Tip: You can export all your contacts as a single vCard and use it as a backup.
The information above is from Import or export a vCard in Contacts on iCloud.com. If you go to iCloud.com on a computer, do you see your contacts?
After that, you will then need to work with your third-party provider for how to import them by using the steps in Contact a third-party vendor.
We hope that helps with your question and take care!