I'm on their 300mps plan but switching to another ...

I'm on their 300mps plan but switching to another ISP soon. I get regular spikes in latency that can last for a while. Among other things I'm sometimes unable to hold calls for work purposes because of this. Turns out there's a chip issue with the modem they sold me (Hitron CDA3-35). Search up puma 6 chip set to see which modems have it. When I raised the problem they just told me to talk to tech support. I tried doing that but it ended up just being a session of phone tag. The lower prices may seem good at first but it doesn't matter if the service is sub par. I'm switching to another provider that doesn't sell shoddy products and respects their customer's time.