Bad, frustrating and intense Experience

Well. My contract is about to end with Cell C and they told me I should give a notice in 2 months time. I called cancellation department many times that I even lost a count but with no answer. Since there was no one to assist in cancellation department, I decide to call Upgrade department and guess what! in a second a lady called Portia picked up the phone, I tell her that I want to cancel my contract and she tries to convince no to, then she says she will transfer me to cancellation department, to my surprise while I was on the line I hear " the number you have dialed is not available". I called back again and they told me that they have a high volume of calls in Cancellation department and they will get someone to call me back. I have waited since then.