Prestashop 1.7 Customer auto assignment to defined groups after registration

[sqooby]

Hi,

I have a shop on presta 1.7.5.1 which connect individual and wholesale customers, but second ones have additional discounts. Now when customer create an account is assigned to individual buyers. In registration form i have company name field and vat number field so i can identify wholesale and manualy change group.

Companies have information to contact with me after registration, but some of them dont read, make an order and then i must pay money back or call to add more products to make up the amount.

I am searching for some module or solution which can save my time on changing account types and making refunds.

The best will be auto assignment to wholesale customers group when vat number field in registration form is filled, when is empty it will be individual client.

Do you know some options to unravel this? Some additonal code or module?