Appualing service even after the Ceo had confirmed my account was paid up, yet they are still pestering me

At first they sent me a settlement letter for my account after I have paid it.. Then they tell me my account has been over due with payment and that I am now referred to their pre legal department... I think the sole reason for them to even try and trick me from my money was because I had previously reported this ********** activity... I will be refering both the demand letter and settlement letter to my lawyers to take it up with vodaco. Surely this suffices as defamation of character and ******ion...