Peefed off client

I changed banks in March - my personal banker switched all my debit orders to go off my new account effective 1 May. When May month came around - no debit order went off and I got overdue sms messages. I called - no one could tell me why the debit order didn't go off and I had to do a manual payment. I received overdue sms messages this month - called on Monday and was told it is too early - debit order will still run. No debit order went off - I got more sms messages about overdue accounts this morning. I called customer care - got transferred to Sales as they struggled with debi check mandate, Sales said they don't deal with debit orders, they incorrectly transferred me to Prepaid, they transferred me to Customer care and the gentleman there wanted to transfer me back to Sales - I totally lost it. I have 3 x contracts - normally 2 debit orders go off. Are you not interested in my business or what is the problem????? I will gladly move to a different mobile provider if you keep this up.