Credit Card ***** Accusations

Last night my fiance purchased a beach dress from Takealot using my debit card to make the payment. This card has been used for previous purchases on Takealot. However today she was bombarded by rude calls from the Takealot call centre claiming ***** and ******* active. Firstly this was from a cell phone number and secondly they were insisting ID numbers, copies of ID and a copy of the card. This sounded like ***** in itself so she requested that they contact me. I took the call and I was asked for those requirements or the order would be cancelled, however when both my fiance and I asked for an email proving that the request comes from Takealot, this was not supp****. Furthermore the so-called manager I spoke to insisted I used a credit card and this was their process as per an agreement with the banks however it was a debit card and she could not provide me with that in the terms and conditions. I have read them and its not in there, which once more raises the concerns of ***** on Takealot's side. Also a OTP is require for the transaction, this was provided therefore this is out-right ridiculous. Is this really the way to treat customers and to enforce T&Cs(unseen on the site)?