Bad Service

I am not a Netbank client, and I keep on getting payment notifications. A Netbank client probably gave the wrong phone number and now i keep on getting payment notifications. After numerous phone calls to try and get my phone number removed from their system, it is still not sorted out. They told me that they will sort it out within a week, I even received a phone call back to confirm that this is my number and that they will sort the problem out. Its been 2 weeks after the call back and still nothing has been done. I am tired of spending 30min to an hour trying to get this sorted out and wasting my time in the process. This is very poor service from Netbank!