Never invest with old mutual

Old mutual started debiting my account for an investment plan I took out but started the debit a month earlier than I requested so the following month which was the month I wanted the debit to run off did run off but old mutual set other debit to chase the first month the debit. My agreed debit date was the 27th and my debits did go off but the 2nd debit they set was for 30th of the same month which didn't go off so every month for the next 3 months my 27th went off but not the 30th.after 3 months they canceled my investment sent me a letter today stating my investment will be charged fees u til there no funds in my investment. I called several times to the cc and again today but Noone has called me back to resolve this. I had no intention to cancel my investment yet I'm left at a loss of my money now. Old mutual just gained all the debits of R750 I paid for all these months.