Suspicious billing. Bad customer service. Lack of integrity

Since the inception of my contract, I have been paying on the 15th. Now my account is suspended because you say I’m owing. I paid on the 15th June as per the norm but you still say that I owe. I want you to answer one question, Why am I required to have made 2 payments for the month of June???? My next payment date is only on the 15th July. I will destroy this little company of yours that already has a bad reputation of bad customer service. You are taking me for a fool. Yesterday I was logging call the whole day and no one cared to assist and today you come with this bull****.