BEING HELD AT A RANSOM FOR CANCELLING CONTRACT

So after countless complaints and hours of my life I spent on the phone with Vodacom, one of my contracts have finally expired (THANK HEAVENS) and obviously I am not planning on renewing it because of the stunningly poor service I have experienced over the years. But do you think Vodacom will let us shake hands and part ways peacefully??? HELL NO!! THEY ONCE AGAIN HAVE TO ANNOY THE LIVING DAYLIGHT OUT OF ME!!! CAN SOMEONE CALL ME AND EXPLAIN TO ME WHY THE HECK I NEED TO SWITCH MY FONE OFF FOR 24 HOURS SO THAT THE CANCALLATION CAN BE EFFECTIVE?? WHO THE HECK DO YOU THINK YOU ARE TO TELL ME WHEN I CAN AND CANNOT HAVE MY FONE ON? SO JUST BECAUSE I CANCELLED MY CONTRACT YOU THINK YOU CAN PUNISH ME??? I DONT CARE WHAT YOUR SYSTEM CAN AND CANNOT DO, BUT I AM TELLING YOU NOW IM NOT MISSING OUT ON CALLS BECAUSE YOUR SYSTEM CANNOT DO WHAT IT NEEDS TO.