Terrible Service and follow ups

I make use of FNB to purchase my devices. I have various accounts with them ( about 10 different accounts). Last year after paying off a laptop with them i took two more devices. As far as i knew, they were debiting my account like they do for all the products that i have with them. Out of the blue, i receive a call from Blake and Ass advising that they have been instructed to collect on behalf of FNB. I had never received a single call from my "How can we help you bank". There is always cash available for debit orders and i know if they had called, i could have transfered the monies. When i called to query why they did not contact me, i was advised that they posted a letter...seriously (my technology superior bank uses the Post Office). It took Blake and Associates one call to contact me yet my bank could do this. Where is the service? Where is the "Help you"? Iam seriously considering another bank after this.