Unwanted upgrades done, customer must just pay???

Good day. I have had my vodacom account for over 20 years now. I have been trying to cancel two lines on my account. Vodacom was very helpful and supportive just for me to relise with my next bill that instead of sending me quote to cancel the contracts whom have expired, they upgraded the lines without my permission. When I tried to phone, the customer care services will simply not help me. Instead, I have to pay now over R2000 to cancel this unwanted upgrades. Trying to get through to a manager is absolutely impossible.