debicheck

I opened an account at sleepmasters carnival mall, a debicheck was made and was told to pay a deposit before delivery can happen and that the debit order will go through after delivery, the following day I called and told them to cancel everything and my debit order they said the debit order has been removed but my bank says its active, so sleepmasters says they can't remove the debicheck from the banking system, so its surprising that the same Marchant that approved the the debicheck cant remove the debicheck