My wife cancelled the contract with Easy but the are still billing her.

My wife cancelled the contract she had with Easy Holidays late September and got the feedback from Easy in the 1st week of October that it is cancelled with immediate effect on the 4th of October. They billed her end of October and even sent the statement for the amount their are going to bill end of November.*** Confirmation email from ********** dated 4 October 2017 time 03:59pm clearly stated that she and easy holiday we done but their still billing her.