Avo not taking ownership of a complaint and passing the buck

I logged into Avo through my Nedbank app and purchased a Macbook for my business. The system didnt allow me to input my business details for invoicing. I made payment with my business card and now the invoice is in my personal name. I need this in my business name with my VAT number to be able to claim the Vat back. You would think this couldnt be too difficult? Well maybe, if you get someone that is willing to help. Avo have merely come back and said they cant change the invoicing details and I must cancel my order and rebuy on the B2B site (I didnt even know there was a difference). However, im sure you will agree to cancel the order now that I have paid for it makes it a much bigger pain. It just feels like no one wants to take ownership of this query to update my company details. If this is what the service is like, I will definitely go elsewhere next time.