Faulty user information & wrong contract

I phoned Vodacom for my upgrade mid Dec. and asked what my average minutes pm used is, to check if I need to change the package I'm on. I was told that I use way more than my contract minutes of 250 pm and the sales person prescribed a contract with 700 min pm & told me I will save now. I checked all my invoices the next day as that sounded a bit much, and found I only use 250 min pm and the guy didn't even consider my insurance cost & extra data. Luckily I picked it up and cancelled the contract the next day otherwise I would be stuck for 2 yrs with the wrong contract. His system was then down and couldn't check my actual usage. I then had to wait for 7 days just to get the contract reversed, then it was christmas and could only upgrade again last week. I upgraded and was very disappointed that I no longer could get a free wifi speaker as originally offered, as the promo was over. I got my phone on Wednesday and noticed an echo so I gave it back yesteurday within the 7 day period, but now have to wait another 5 days just so they can check it out, before giving me a new phone. I am so disappointed in all the time wasted and all the admin just to do an upgrade.