In accurate debit/rejection

I am very disappointed with platinum the way the handle my policy, I have been a loyal client years. In august they debited R424 from my account and I queried with them that my premium is R271 not what has been debited and ask them to reverse I don't know what happened now in January they double charge me not even informing me just debit from account, asking them a very rude lady told me that my premium was rejected in August to my suprise I was not told anything, four months pass in between without saying anything to me only in January they just double debit also not saying anything I only find out from my statemen when I call them that rude lady keep on saying you missed the month of August and send me a typed statement which I am not happy with. I very angry and disappointed also need explanation. Snowy Mosia