Getting zvezda kit sprue?

Hello, my 2 zvezda T72B3 arrived, tho I ran in a big issue: one of them has the turret sprue but not the other, I don’t know why, both kit were sealed so it’s not the seller fault and someone from my modelism club had the same issue with one zvezda kit with a missing sprue. So who should I contact to get the parts in europe?
Thanks for your answers!