uk1000

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This is what the Terms of Service says:
See https://www.fiverr.com/terms_of_service
Where they say "Any additional account determined to be created to circumvent guidelines...." they would likely think any other account you created would be against the rules (if they were both active anyway - they can allow one to be closed then a new one opened) and suspend the account(s) if they found out. But you could check with CS if you were thinking of creating a business account (I'm not sure if they are saying you can have a normal account + a business account).

Yes you can send me the screenshot of Fiverr support messages (but if you do you should blur our/remove the name of the person to make it okay with Fiverr rules).
Though I assume it will basically say what you've said in your initial posts here.
I think it's worth telling Fiverr that your brother shares the same connection, but still let them know that neither of you have made any purchases (if that's the case).
You can prove you haven't made any purchases by screenshotting the relevant section of the buyer section of your Fiverr screen(s) and attaching it to the support ticket and asking them to view that. Maybe ask them to also show you proof of any orders they are claiming you made (that violated any rules).
For the "feedback boosting activity" they might have also meant asking for 5 star reviews or something (I'm not saying you did do that though) if they weren't totally talking about making orders. Maybe they could be talking about asking the buyer to split an order into an unnecessary high number of orders just to increase the amount of reviews and asking them to review each. I'm just guessing what it might be though.
But if they're saying you made purchases when you (and your brother) definitely didn't I definitely contact them more about that with proof.

You could see what time it actually clears (maybe it could clear late tonight). You could record the current time and what progress percentage it shows for the order or a few of your orders. Record the order completion dates & times of those orders (and make sure that what it shows for the completion time on the order page is correct according to your time-zone). Then if you notice the time one or more clear, see if you could have worked it out from the values you recorded.
eg. if at the current time it's 92.85% find out the amount of minutes it's taken between the order completion date & time and the current date & time, and multiply that number of mins to get the number of mins it will take in total. Then add that total mins to the order completion date & time to get the estimated order clearance date & time.
But if what it shows for the progress percentage isn't accurate you could contact CS for more info on the time of order clearances (eg. whether it only clears within a certain time range on various days due to bank working hours or something, whether the 7 days they specify is a maximum or just an approx nr of days - eg. if it could go over by x hours).