It has been stated that a £9 refund CAN take up to 14 days, so why are you stating that I think one of £8.37 should take a month?
I note how you deliberately omitted quoting the part of my post which answers your question (presumably in your quest to be as awkward as possible). I'll quote the relevant part:
Charges for calls can take a time to reach the ISP, so to be safe Plusnet would probably have to wait a couple of weeks before issuing a consolidated final statement and then it would take up to two more weeks for the refund to reach you.
I'll spell it out: At the moment Plusnet initiate the refund before
they have received all the data for the last few phone calls. If they were to issue only a final statement with a single refund or charge they would have to wait a significant period before they could be sure all the data had been received - I suggested a couple of weeks (but that may not be enough). Only then could they start the process of issuing the refund which would take up to a further two weeks (10 working days).
Now I don't know what they taught you when you were at school, but I learnt that two weeks plus two weeks was as near as dammit a month!
Plusnet user since November 2001