Faulty Products

I have had issues with a Samsung S3 since getting the phone 2 years ago. I have complained multiple times to which Vodacom just respond that the phone needs to be booked in. The phone was booked in for about a month over December and January, after which IT WAS WORSE!!! I'm so disgusted with Samsung that I got a Huawei recently and took the phone in AGAIN to Vodacom. From previous complaints logged about this same issues, Adnaan from Vodacom said he'll motivate for the replacement of the phone seeing as there has been endless issues with it. Today I receive a call from Vodacom, saying they just \repaired"it again and want to INVOICE ME for the replacement of the battery"