Mtn Shamefull

I had a contract by Mtn the contract expired almost 2 years ago the phone contract a month was R150 a month without notifying me that my contacts is comming to and end the accumulated thousands of rands in the past 2 years after the contract expired! Now they have handed me over to some lawyers that in my case they should have notified me before doing that but instead I got absolutely no warning nothing not evens an email or a letter by post! I think its shameful that I big company like Mtn can do this without your knowledge!