Craig Scroggie, managing director of data storage operator NextDC, has slammed Bankwest for "aggressive enforcement" and "fee-grabbing behaviour" after the bank issued a default notice for a $29 million facility to a property trust the digital powerhouse has taken over.

Mr Scroggie has doubled down on his previous lambasting of the bank and upped the ante, calling in Deloitte to investigate the property trust's banking records, potential misappropriation of funds, and its dealings with Bankwest.