Hi ritchinsen,
Welcome to Sony Community!
If they reinstalled Windows 8 using the recovery partition, there is a possibility that you can reinstall the operating system again by following the step-by-step guidelines here: https://us.en.kb.sony.com/app/answers/detail/a_id/36806/c/65,66/kw/recovery%20outside.
If you can't access the partition anymore, kindly visit this link to contact Sony Authorized Parts Distributors: https://esupport.sony.com/CA/p/model-accessories.pl.
Regards,
Vincent
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