Unacceptable poor service

I went to Edgars in Fourways Mall 2 weeks ago to open an account. I was not asked to complete an application form, the guy helping me asked me all the questions verbally and typed my answers in his computer. He NEVER asked me if I want the account on 6 or 12 months, however I told him I want the 6 months interest free option. He asked me if I want a funeral policy, hospital plan etc. I said NO to all those extras. Now my account is opened it is on 12 months and there was a funeral policy loaded on my name. I went into the store to correct this. They cancelled all the extra services but they tell me they can't change my account to 6 months. This is unacceptable!!!! I never asked for 12months!! Sandile at your head office was very unhelpful. Surely you can correct this because I, the customer, did not ask for 12 months! It was your mistake, not mine! I expect a response and I expect my account to be changed to 6 MONTHS interest free.