Vodacom throttling my network regularly

I've noticed every month on the last two days of the cycle, when i have data left on the \FREE"midnight data bundle and i want to use it the network is never available (aka EDGE). But as soon as the period is over (after 5) i get the fastest speeds (LTE). In other words i can never use all my data and always end up having to go out of my daily bundle. I have a no device contract and they already breached contract so they might as well cancel the whole thing. The line in question is ***."""