Vodacom workers are useless with details

Did a upgrade at Vodacom mall@reds, phone is giving problems, and now a brand new phone needs to be send in to the technicians, lady that helped at the store only said that if i have any problems with the phone, i have 7 days to return it, but returning it only means that you won't have a phone for 7 days while this useless company wants to see what is wrong