Incorrect Information supp**** by call centre

I have just joined the scheme on the 1 July 2015 and I have now encountered problems. I specifically requested the first debit order to go off at the end of July as the existing medical aid (last deduction) was going off at the end of June but to my astonishment Topmed have disobeyed the instruction but confirmed that it would be done accordingly. Please refer to your recordings to confirm that I have instructed same. I called this morning to enquire as to why it was debited and was told that payments are done in arrears. WHY DID YOU NOT TELL ME WHEN I WAS INSTRUCTING YOU TO DEBIT THE ACCOUNT AT THE END OF JULY? This payment will be reversed today and the payment will be made at the end of July as originally instructed. I am not sure what needs to be done on your side but please sort this problem out as soon as possible. Your call centre agents did not give the correct information to me, therefore Topmed is liable. This is not client satisfaction.