RCS call centre no help at closing your account once settled

I have trying numerous times to cancel my account. settled in full. I just get transferred to a 'department" who never answers the phone. I call again and tell them don't transfer me , they are not answering, i just get told okay and then again they put me through and no one answers. You get no help from the call centre agents, and it seems they do this on purpose so you cannot close your account, or they simply do not care for their customers at all !!! Still not been able to close my account !!!