Double payment

I was a Nashua mobile customer with vodacom as the service provider. The account was moved over to Vodacom in January 2015. The first payment did not successfuly deduct and I was notified of the problem. I immediately deposited the money into Vodacom's account on 05.01.2015. I provided proof to Vodacom of the payment. In February 2015, the January and February deduction was taken from the account. I notified Vodacom of the error with the double deduction on 2 April. I have followed up, however, this has had not yet been resolved.