MTN Bad Customer experience

MTN send me a SMS to tell me I am due for an upgrade. So, I contact their online sales and we go through the options and conclude the deal. I receive my new device as scheduled. I have received my first statement with the new device, now all of a sudden there is a fee that MTN is charging for early termination of my previous contract. At no time during the sales call was it mentioned that I would have to pay an early termination fee if I want to upgrade, if it was mentioned I would have never upgraded at this time. So, obviously i did not pay that part of the invoice on my monthly fee and now MTN has suspended my service although I have paid for the device and my monthly contract fee. This is how MTN treats their customers who has been loyal to them for now 25 years. This is shocking.