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$699.99 (128 GB only) device payment purchase or full retail purchase w/ new smartphone line on One Unlimited for iPhone (all lines on account req'd on plan), 5G Start, 5G Do More, 5G Play More or 5G Get More plan req'd. Less $699.99 promo credit applied over 36 mos.; promo credit ends if eligibility req’s are no longer met; 0% APR.
Your actual speed is the lower of either the provisioned speed, or the highest speed your DSL modem can negotiate with the Central Office Equipment. From your transceiver stats your DSL link isn't the problem, it is
7616/864 kbps. However all that DSL link is an on/off ramp for the internet.
That means the problem must be either upstream or downstream from the DSL link. That could be a firewall or software problem in the PC, or a Verizon problem unpsteam from your line.
I would suggest running the ndt.anl.gov speed test, and pay particular attention to the statistics and other more details tabs that are available. The information in those areas can be quite enlightening.