Buyer cannot action cancellation request

A buyer has made 3 x purchases from me but no longer wishes to continue with the transactions.  I have sent 3 x cancellation requests through but the buyer is not able to action the requests and the message says "information on transaction unavailable".  How can this be solved and the cancellations actioned?

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If they are not responded too they will close in the sellers favour after a few days.

Other than that call ebay Customer Support Follow the prompts till you see the free call number.