Very bad telephone etiquette

I have an account with House n Home, which due to unforeseen circumstances has gone in arrears. I have been receiving calls from a call centre agent,named Ilse (Stander Attorneys) as well as very abrupt sms's and voicemail messages. I have requested that another agent contact me by which I would gladly make the necessary payment arrangement as I do not want to speak to her. Its very unprofessional to act in such a manner not only to me but to whomever might answer my phone. Yes I have terms and conditions in place, but ultimately you are still to serve the client. I would not recommend them to anyone, their after service sucks. Instead stick to the bigger household stores like Game and Makro.