Bad service

Very bad service from Dischem. I have been requesting banking details to be changed for the past week! I have filled in the banking form and sent everything else that was requested. I have been phoning and I am told the same story over and over to resend the send documents. I have resent the documents 3 times! I spoke to Stella earlier on and the call cut, she didn't bother to call back. I have sent an *** and requested a call back and nothing! Clearly keeping clients is not a priority. At this point I want a supervisor to call me before I take this complaint further.