Prepare for a fight if you wish to end your contract
This is a completely unprofessional establishment with multiple staff members at the call centre who will repeatedly ignore any instruction you might give them, no matter how clear that instruction may be. I can understand why people swear on these calls as I had to scream at them at least ten times to cancel my contract. It is apparent they are tasked to either address your concerns and keep your business, or to wind you up so that you put the phone down and give up trying to cancel. I stuck to my guns and have been told my plan has been cancelled. However I am now confirming in writing as I do not trust them and have no proof of the cancellation. A shameful way to behave.