Vodacom *****ing me on upgrade YET AGAIN

Once again, same as my last 5 upgrades, Vodacom is giving me hassles to upgrade my number.... every time it happens. I've had this number with Vodacom for over 25years now, and it's now time to change providers I think,,,, Placed the online order for my new phone, everything was confirmed, delivery to be this week, now the lady phones and says Vodacom's cancelled it, and I can only get it if I take a more expensive contract. I've had enough of the useless money hungry Vodacom....