She was paying for 512/600k (depending where you lived at that time) broadband.
The fact that it was £5.00 less than normal suggests (as Graham & John suggested earlier), the she got a discount for buying her own cable modem originally.
There has been many many problems when people up/downgrade their BB packages when owning their own modems over the years, as ntl no longer apply the discount once up/downgraded.
Should you get £5.00 off you monthly BB bill as you own your own modem? Yes-in my opinion you should get that £5.00 off per month regardless of what speed package you are on.
ntl in their usual lame way never communicated anything about this to customers, & it was only when people up/downgraded that the issue came to light on their next bill (it was still not even mentioned during the upgrade phone call so that the customer gets a choice to stay on the current tariff/price
People have contacted ntl & got the £5.00 per month discount re-applied, but you will have to go high up to get your plight heard, as all the CSRs that members have encountered when ringing after getting their bills is
"There's no £5.00 discount available once you up/downgrade.
That's no good
after the event, & ntl should honour the £5.00 discount as long as they have your business IMO.
List of contacts
here.
Good luck, let us know how you get on.