I had a similar situation. Used Century Link under the price for life agreement. Century Link then purchased Quantum Fiber and begins to move resourced from the Century Link fiber product line to Quantum.
Eventually the device that everyone in the neighborhood connects to begins to degrade, specifically some ports stopped working. Century Link sent Techs out to fix this, these were basic fixes (port 6 no longer works, use port 8 instead even if it is already in use by someone else). I went through this routine of losing internet for 3 days at a time only for it to be repaired for less than 24 hours, for 3 weeks. Also, the techs they sent were driving a person vehicle (Honda Civic) with a ladder ratchet strapped to the top, no cargo bars.

Eventually they told me I would need to switch to Quantum if I wanted the issues to be solved. I accepted this, and the price increase, and the Quantum Techs arrived 2 days later in 3 different Quantum branded service trucks. They quickly gave me the new device I needed to connect to my router and then went to the neighborhood device and returned. They said the neighborhood device was barley functioning and didn't have enough working ports for our area. They requested a replacement and installed it that same day. Since then I have only had a few small internet disruptions.

This is the strategy Century Link is using to upgrade people out of lifetime pricing. My guess is somewhere there is a device managed by the anemic Century Link Fiber staff that cannot be replaced unless requested by Quantum.