There has not been a MAC version of Sound Forge for several years and I understand there are no plans to create one, sorry.
For details of how to cancel your purchase and request a refund of your payment please read this web page, especially section 3 which deals with cancellations and refunds for downloaded software.
Thank you. I have already emailed for refund claim to shop@magix.net sales@magix.net support@magix.net . Still waiting for response. Probably right now is not working hours and i will try to wait until the Monday evening.