How to cancel TV service ???

This is a nightmare. Impossible to cancel in At&T stores, impossible on the website. You must call their 800..... and WAIT !! More than 10 minutes. Afterwards you will be asked for a PIN number you have forgotten, a question that does not make sense, and they will call an old phone number you gave them 10 years ago for verification. Obviously, nothing works, and you continue to pay.... This is not modern at all. Especially from an Internet provider !!!

I am a foreigner, I must leave and come back to my country, and I am obliged to send hours on the phone to attempt to cancel my AT&T services. This is a scandal. Four years ago when I moved, it was the same. The customer service is terrible.