Impossible to cancel contract

<p>I have tried to cancel my mothers contract since 28Th April. She is in frail care and not mobile. I have a signed letter from her requesting cancellation. I have email customer care with request. The refer to call center. When you get put through to retentions it goes unaswered. I have try about 10 times. Went on the Sunday to NTN in Grove with my Mother in wheelchair and surly man told me the branches can only do it during office hours. Just cam back from MTN Rosebank and they say they cannot do cancellation at branches. I complained about retentions not answering. They dailed and agian retention down answer. The branch assured me that that is the only way and if they dont answer I cannot cancel. I think it is extremely bad business practice to make it impossible for a person to cancel a contract</p>