Did you meet all the requirements and follow all the steps when you submitted your Sit cancellation claim ?
Did you ….
Inform member services (MS) of the cancellation within 24 hours ( if you called the Urgent Support Line they have a transcript of your call )
Send MS a screenshot of the message where the host asked you to leave .
Submit The receipt for your alternative accommodation showing the address* amount paid and dates of your stay ?
*this must be with 20 miles of the sit .
There is a thread that discusses the process here -
If you followed the process , ask MS for the reason why your claim for reimbursement has been denied.