Unfair accusations and customer service

Im so disappointed in the service i have been receiving from pro admin. I had an account with them and was not receiving any statements each month i would just assume how much the bill would be and make payments one day i short paid with less than R150 and they disconnected their services which i understood and suzette helped me with everything she was really amazing. I then settled my bill and moved out. The issue was the account was under my name still and they were people still staying there. What annoys me the most is that as i type this those people staying there are owing R8000 and something from last year October. Why aint they disconnecting their services?? I moved out in Sept. I informed them and gave them the email address of the person staying there as i was now receiving statements. Now they say im liable for october bill. I mean the last payment was when i was there. There was never a payment since the time i said i left. I mean common sense says that its them but they say i have to pay for it. Why is it that they running away from the fact that those people staying there has never made payments until today and the bill is morethan R8000? I will not be liable for a bill i did not consume. The person i was in contact with is Shorne she doesnt even seem interested to assist. She just keeps emphasizing that im liable to pay the bill. They must speak to those people staying there and leave me out of this. Im willing to take this further if its not resolved. Ever since i was with pro admin it has been a hustle until i met suzette who is really an angel. Atleast they should hear me out. Shorne is not interested and also informed me that she wont be taking part in this conversation anymore so ill get social media and my lawyer to take it further. I'm tired of bad service.