Get your house in order

On 31 December 2015 Vodacom double debits my account. On 4 January 2016 my bank reversed one debit order. No additional payments received from Vodacom. Thus, account paid as per 1st debit order. Now today Vodacom advises me that my account is in arrears with the full amount. SO...first I pay them twice in month, their fault. I get back the money they owe me via the bank, now they claim I owe them AGAIN!! I had to send them bank statements now to prove I am not at fault. How does this work, highly unacceptable. Sort this out now!!