Getting below 50% speed with the Performance Pro plan

Hello,

This is absolute frustrated. I have no idea why xfinity charged me for an extra $15 for a performance pro speed that was up to 175 mbps. However I got a download speed of 65 mbps from Google speed test, and even 58 mbps download speed from the official comcast speed test, not even half of the 175 mbps. I ask customer service and they transferred me to the comcast customer service and the comcast customer service transferred me to the xfinity customer service and the xfinity customer service is closed today!? This service is absolute trash, I'm like donating money to xfinity, consider not using comcast for the rest of my life...