SHOCKING SERVICE

In short, I bought my phone on a Sunday. Was given the wrong phone, wrong SIM card and misinformed about my contract. The Phone did not work. No apps worked, battery died after 2 hours, no signal at all. I took it back within 7 days. Vodacom repairs has not tested the actual faults and is STILL refusing to replace the phone. Why do we then have 7 days to return the phone for and I quote \Any issues with the phone"??? I have had ****py feedback from repairs"