No debit going off but i get smses that i owe

I would like to express my dissatisfaction and disgust to the unprofessional n horrible service I have been getting from capitec bank for the past month. Last month they debited an account which I never allowed them to debit and when I questioned it at the call centre and at a branch I was told I didn't have funds on the account that they \debited". I asked how they could say that if they didn't even attempt to debit my account which had funds available. I had a statement to motivate that the lady at the branch suggested I call the collections dept. I was disappointed but let it slip"