Primus Telecom Customer Service Issues

We recently switched our internet service from Telus to Primus through Costco. The Telus internet was reliable and consistent at 75mbps, but our new Primus cable internet (account [redacted]18) is extremely inconsistent. Our Ethernet speeds fluctuate from 2-120mbps for downloads and 1-4mbps for uploads. The wifi speed is poor, often around 15mbps or lower. We have experienced modem shutdowns needing manual restarts, which is frustrating. I am unsure if this is a signal, hardware, or software issue, but the unreliable speeds are unacceptable, especially through Ethernet. Please address and resolve this issue promptly.