Terrible *********** Service

I tried to cancel my contract with Netstar and sent numerous emails and letters to them. This did not work so I eventually put a stop on my Stop Order as they continuously debited my bank account. I paid a cancellation fee as I had to get out of my contract with them. They are now sending me threatening sms's and I have had over 50 phone calls to pay the outstanding amount of R173.88 which was paid over 2 weeks ago and despite telling Netstar and their debit recovery (only 2 months old the debt) company they do not have anyone of any ability that can understand that I have paid the outstanding amount and have sent them and the NUDEBT department the proof of payment attached the invoice that was sent, and today again I have received another email with a different amount of demanding payment. This is absolute disgusting and *********** service from numerous people at Netstar.