Hi, yilidiz 

I am sorry that you are having a difficult experience with our plugin.

I can assure you it is absolutely possible to connect same Calendar to multiple sites.

If you wish us to help troubleshoot the issue, please provide us with more details, what kind of error did you see when you try to connect it?

Is it integration with Google, or Outlook?

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If you wish to reconsider about the refund, I strongly believe that we can easily help you find the issue and resolve it.

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But if you are certain you wish to have a refund, we understand.

Here is the best /quickest way to get a refund, through our Store :

Please log in to http://store.tms-plugins.com/ and under "My Licenses" click on the Three Dots on the right-hand side of the license you want to submit a refund request for:

If you don't see it, that means that the 15-day money-back guarantee period ended, and as per our refund policies (Amelia Refund Policy, wpDataTables Refund Policy), you're no longer eligible for a refund. After you submit a refund request, you will not receive any confirmation emails, but you will see that the button is grayed out:

That means that the refund request is successfully submitted and that you will receive your refund in 5 - 7 business days.

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Let me know if you have any questions, and if you reconsider,  we can help you connect a Calendar to multiple sites.

Thank you