How are you measuring speed, and is this worse than before you increased your contracted speed? If you weren't getting the full 200 Mbps in the first place, then upgrading was probably a bad move, and you should consider cancelling the upgrade in your cooling off period.
Assuming that all was good before, it could be a power or noise issue, or it could be that a wireless device is only connecting on the 2.4 GHz band, and only managing an 802.11g connection.
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Welcome back to our Community Forum, I'm sorry to hear that you're experiencing some speed issues after your upgrade!
Have you taken a look at our Speeds page to see how you can improve your speeds at home? Has a pin-hole reset helped your home connection?
Please give this a try and let us know if this helped.
However, after taking a look at your account and checking your power levels, I can see that your power levels are out of spec and could be causing this speed issue. We will need to have a technician appointment set up in order to have this looked into further.
I will send you a Private Message in order to confirm some details, so please keep an eye out for a purple envelope at the top right corner of your forum page.