Vodacom not assisting people

I want to fill an complaints about vodacom in the boardwalk across the pet shop that mislead my friend with false hope about a phone she got because she is deaf. She did not know that she could take the phone back with in 2 days. One of our friends went yesterday with her and they said they could sort it out now she came back today they didn't want to sort it out and ill treated her badly and the phone vibration is not good enough for her to actually feel it when someone is contacting her . I would like to try and see if we can give the phone back and try to get her something else as she is paying a lot of money for the phone and it's not even worth it. My other friend took her there and they told her to come back the next day and they can help and when she went back they refused to assist her and treated her bad. I would like something to be done .