Vodacom-useless service provider after Eskom

I have a contract with vodacom for a very long time, I am supposed to get data (day & night owl) I am billed for this every month my account is up to date but for months on end now I haven't been able to use my night owl data.

I have called their useless customer service call centre nobody was able to assist me for months now, they say my night own is allocated but when I go to the net during the night owl time 00:00 - 05:00 no internet access 😡😡😡

It's a losing battle and I want nothing to do with Vodacom anymore. Every time when I call their customer service one consultant tells you this the other tells you that (there's no straight answer, no consistency) it's a big red mess.

Is there a way I can get out of this contract right now without being penlised?