Duplicate billing on Home Phone

[#1]

It would seem some / many of us have been billed a double amount for our Home phone
I was debited two amounts of £9.99 for my home phone - and have been promised a refund at some date - not defined.
I never had this problem with Onetel - so it has dented confidence in PN 
Anyone else had the same problem ?

[#2]

Hi there,
Sorry about this, it's a problem we are working on as a priority and has affected more than just yourself. We've emailed the affected customers to explain and also have a priority problem on the website about this.

[#3]

Well OK - but because the amount was higher than expected - I hadn't put enough money in the account and teh derect debit bounced and to make matters worse your system applied a failed payment penalty 

[#4]

Hi again,
If you can raise a ticket explaining any extra (bank) charges you've had to pay we'll of course refund them to you. We'll also make sure that you get a refund for the call barring charge that has been applied.

[#5]

I've raised a ticket as requested, but just to make things worse - although I paid the arrears by debit card on the PN website, on Tuesday, I now now have a duplicate direct debit for the same amount yesterday ( Wednesday ) on my bank account.
I'm loosing faith in PN's billing system I'm afraid.