LTE Network from 19:00 to 22:00

So I have been Monitoring my internet for the last month and every night from 19:00 till 22:00 my internet is slow the sync speed is like 2mb and the ping to any server spikes to like 90 to 100ms. Early Morning and Late afternoon is fine great speed the ping is fine comes 19:00 it's a nightmare

So streaming on this is useless Gaming on this is Useless because of the ping to the servers Viewing Content on the Internet is not fun at night bec of the decreased speed syncs.

So why do Telkom users sign a contract that they need to uphold when Telkom can't uphold there service?

I feel if one pays for a Service one needs to deliver