Terrible Internet Connection

I have become extremely frustrated with my Xfinity Internet service. I have been an Xfinity customer for over a year and never had any issues until I moved into my new apartment this summer. My current apartment had

Xfinity modems pre-installed in each unit. I called Xfinity‘s customer service number to have an agent help me transfer my service address. This agent claimed that I was unable to use the preinstalled modem, and that I would have to bring the modem from my previous apartment with me. When I arrived at my new apartment, I was unable to establish a connection with either modem. I ended up going to a physical Xfinity store where the agent informed me that the person on the phone removed the preinstalled modem from my account and that the only way to get it back on my account was to call customer service again and potentially sit on the phone for hours. The person at the Xfinity store ended up giving me an updated modem. I was able to successfully install this modem in place of the preinstalled modem. However, I have experienced connection issues with every single one of my device for the past two months. The Internet constantly drops on my laptop while I’m working, I’m unable to connect my tiny pet camera, and my television lags. Speed tests on my laptop frequently fail to reach over 1 MB despite the app claiming that I have perfect signal strength or that my device is “sleeping” when it’s on. Im strongly considering switching internet service providers if this issue is not addressed.