Confused and charged more

Good day

Will you please kindly assist. I have called the call centre numerous times and not getting any help. My last call lasted for 15 min with me holding to get some assistance.

I was on maternity leave for 3 months - July to sept last year. For 2 months the insurance paid my debit orders....the last month was not covered of which i called in and made an arrangement that an extra 500 rands be deducted untill the full instalment for the missed one month is covered .....every month i had to call in to reinforce the arrangement....i was told that i dont have to call in my instalement will be increased with the extra 500. This happened in December...however nothing happened in jan and feb.....instead more interest was charged. I am confused and certainly cant afford more interest. Will you please assist in resolving this and making a proper arrangement.