Charged for insurance after providing documents

Im disgusted with the way things r done. I received an sms requesting me to provide absa with info that im insured. I did that twice even have an email confirming that my documents were received. Im surprised to discover that an amount of R533.95 was added to my premium. I demand that my money be deposited back into my acc immediately. Absa i have a set premium with u. What makes you think you can ***** peoples money?