I have had the same problem you have had, but I used a PayPal Debit Card. I canceled my service in late April, and they are still trying to leave messages on my cell phone. I am going to use a Block caller app on them, and for charging. I researched in advance about Clear’s way of taking your money even after you have cancelled your service. So in advance, and for anybody looking into Clear’s Internet:
-Use some sort of load debit card you can load to your specification. I used the Paypal Debit card for my purpose. For me, I just said to Paypal that I lost the card and the gave me a new one.
-Second, use a different e-mail address don’t use their, so-called google email, if you do not like it.
-Third, if you are using a cell phone get a block caller app. There are a lot of free ones you can use to block calls even 1-800s numbers.
I used the internet for school purposes, but I lived extremely close to the cell tower that they were providing the signal, but I moved recently and the area that I am living now, is like a dead spot to Clear, even if the tower is closer to me than ever. I also, have to talk to the operator to cancel, and I expected that he did not know his job at all.
Worst internet provider ever. They still call me, and they have the gall to call me a delinquent because they are still charging, but since I changed to the card number on Paypal they can’t do anything, but harrass on the cell phone, which I will block their calls sooner or later. Their calls are not hindering my life,….at the moment.