I can assure you that bitblender has no reason to scam for 25 BTC.

If you look at their signature campaign alone they have invested 24 BTC into advertising their service. And this is excluding any other marketing. Why would they throw away all the trust built and potential profits in the future for 25 BTC?

I think it is most likely that you clicked on a phishing link. If not, then keep trying to reach support. Eventually you'll get a response for sure.