Customer group by address

-- HikaShop version -- : 2.4
-- Joomla version -- : 3.4.8

Hi,
how can I do for assign automatically a different customer group when my customer registered on my site?
My ecommerce have different price for customer group, this is based by address expecially on ZIP and district, so when people do the registration form based on what they write they will be assigned to a customer group; example:
- one customer write 30022 on CAP and VE on district, so its customer group is Venezia
- one customer write 31010 on CAP and TV on district, so its customer group is Treviso

I hope that I explain myself
Thanks so much
Matteo