Unreasonable service

On the 26th of February I went to capitec bank at Senekal and the manager banned me when I asked why he couldn't explain to me kept saying it's because my sister complained so I'm very much surprised to hear that people are being banned for complaining due to bad service..I wrote an email to their client service center and the only respond that I got was "sorry I do apologise for the delay your and please be advised that I sent the following to the branch" I'm very dissappointed because I need to go inside the bank and I can't so what do I do now??