Account payment

As my salary was paid in later than usual, money was not available in my account for the debit order on 27th. Knowing this I went to the local Vodashop wanting to pay the instalment plus returned debit amount on the 29th. When I got there the gentleman behind the counter assured me that the debit order had gone off, and printed out a statement showing that my balance outstanding was in fact R0.00. Not worrying about it any further I went my way. A week later I started getting SMS's from Vodacom as well as calls that my account is in arrears. I then contacted the Customer Care where I was informed that the debit was returned on the 30th. Consequently both my contracts have been suspended and I have to pay a minimum of 75% before it is re-activated. Now I am just wondering where I am supposed to get the money mid month? As far as I can see this is not an error on my part of non-payment. I did the responsible thing and went into the store to make payment and was told the debit was paid. So what now? Do I wait till 27th again when the next debit order goes off? <br> As a long-standing client with Vodacom I must say I am very disappointed