Poor Service from FNB

We(our business) submitted a debit order dispute with accompanying docs almost 4 weeks ago and still no response. I then called the call centre( 1 hour on the one day and then 1 hour on the following day) trying to explain that we have had no response. The agent finally sorted it all out and told me it would be sorted out in 6 business days, I said no that's not good enough, and he said it would be escalated and sorted sooner. 3 business days later still nothing. Such poor business banking service from FNB.