Unhappy with service form Mweb

So my mom had a Mweb account and she did put me as a contact under her account so that Mweb could help me on her behalf so she cancelled her adsl account with Mweb a long time back so last week I called in to sales asked them to add showmax only and the sales person helped me and everything then when I called billing for a question I had I was told that I was a contact on my moms old account not her new one and they can't help me when I told my mom this she was so upset because this is unacceptable we need help to re add me as a contact or my mom say she will cancel everything with Mweb because we never had a problem like this please help if you value my mom as a customer you'll help