No end of contract notification

Hi , my contact has come to an end and as such my monthly payment has risen from approx £85 to £201. Understanding that this is the case , but I have not received an end of contract notification, which I understand is a regulatory requirement. Clearly have had no options , just the new payment taken out . Will be phoning to cancel but will have to give 30 days notice which will be another £201. Any thoughts ?