I had a similar issue. Was offered a Cinema cancelation offer for £3.99 a month for six months which I accepted. When the first payment came out in June they took £5.99, despite my account showing the £3.99 offer applied. They credited to £2, but ...
I have the same issue - was offered 3 months free for entertainment, but can see that when that offer starts this month I will be charged £3.60. Clearly something wrong with that particular offer.
