I recently made a move from Vodafone Cable 100 Mbps to Telekom GlassFiber (150 Mbps) + SpeedPort 7 router. I am a software engineer working mostly from home and need to have stable internet for work and for gaming. My Vodafone Cable was very stable and good but because GlassFiber was available at my location so I made the switch thinking it would be better for my work and gaming. But ever since I moved to GlassFiber, I am facing issues. My ping is unstable and my internet is pathetic. I raised the concerns about this but I am getting no resolutions so far. 

I might lose my job if this continues. I am feeling so bad because of this internet. And I regret moving to Telekom from Vodafone. Here are some screenshots of the misery I face on daily basis. Please note the jitter and ping spikes.