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If you have some time, stuff it in a plastic bag and put it in a freezer for 3-4 days at -20°C ... does the job and would not destroy any fabric, shoes or whatever.
You haven't provided much information and that makes it very difficult to figure out what your problems might be.
A WhatsApp call may go unanswered for many reasons including you calling at a time when the person receiving your call is asleep...
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