MTN are ****ming me

I purchased the 5g uncapped mtn bundle, for the 1st two months the internet worked flawlessly, but as of last week thursday they have decided to throttle my internet, my subscription states i will only be throttled after reaching 1tb of data usage, i am only at 300gb of usage this month, my internet is being throttled down every single day from 8am to 11pm, i have provided screenshots every single day even showing screenshots 3 minutes apart, at 10:57pm internet speed is 10mbps then magically at 11pm ON THE DOT EVERY SINGLE NIGHT it magically goes up to 50mbps, the speeds will not go any higher than 10mbps outside of 11pm to 8am, this goes against the contract that i have signed, this is clearly a **** from mtn, your shady business practices disgust me, i pay R899 to have 10mbps? f*k you