I signed upto cinema pass for £11.99 a month, a month after signing up my account showed that it would be £5.99 for 6 months. I was charged £11.99 for a second time last month even though it should have been £5.99
Check this link to confirm your payments.
You can also use this link to make sure there are no duplciate accounts.
Then use this form to fill out and provide as much info as possible.