Initial bill query - no BB discount

[#1]

Signed up with Plusnet last week for unlimited ADSL (£9.99-£5 discount/month for 12m + phone at £14.50/m + router P&P @ £5.99).
I have two emails dated 31/07/13 that say a payment of £30.48 has been raised to leave my account on or after 5/8/2013. This is for the one off payment. The invoice off my account area for this is: Plusnet Weekends @ £14.50, Initial subscription @ £9.99 and P&P for router @ £5.99. The £5 discount has not been applied. The email I got on signing up said this initial payment would be £25.48, which correctly includes the £5 discount. So there seems to be a mistake with the £5 discount not having being applied. One of the three emails I had on signing up was confirmation of the 50% discount to be applied for 12 months. Can someone correct this please. I don't know if you can tell my username from my forum name.
Thanks.

[#2]

OK answered by CS this morning on calling them. Apparently if the initial bill is by DD as I chose mine to be, a system error fails to include the £5 discount. This will be corrected by a DD to me of £5 once the £30.48 is processed. Seems if I'd paid by card at signup it would have been correct.

[#3]

Hi there,
Apologies for the issue and that we've not been able to reply any sooner.
Glad to see that sorted.
Adam