Poor after sales service from Vodacom Midrand

The after sales service with Vodacom is pathetic. The manager at the Vodacom 4U store (Richard) is very happy to help make a sale but then when I come their 4 days later with a faulty VR headset he tells me that he can't help because it is an accessory and that I must go to Samsung to get the unit repaired. I haven't even had this product for a week and it's faulty. It upsets me that once Vodacom has sold you something they don't care after the fact. I am under the impression that if I purchase anything from Vodacom and take it back within 7 days they will replace it. I don't care if it is an accessory or a phone it shouldn't matter. It is unacceptable that Vodacom doesn't care about their customers after making a sale. I am still awaiting a solution to my problem and have yet to get an answer!?