I would investigate further on this. If it's the MSC who does primarily bank shops and recently had a gaffe with shopper payments, they sometimes have conflicting instructions and other issues.
Recently I was sent an email posting for an assignment at a bank where I was supposed to pose as a NON customer. The dates didn't work for me, so I emailed the scheduler and asked if I could do a different date for the noncustomer scenario. She responded that they were scheduling customers of the bank only at the time. I emailed her back to ask why I received an email offer for a noncustomer scenario, and she never responded.
Several months ago the same MSC wanted me to do a credit card opening for a particular bank card at a hardware store. I was supposed to go in and select an item of $200 or more and see if they offered the card. If they didn't offer the card, I was supposed to ask for it. I went in and followed the instructions. Financing was not offered. When I got to the register to make the purchase, I asked about the card when the cashier did not suggest it. I was told they did not offer any credit cards. I asked them if they had previously offered this credit card (by name) and was told that they had never offered any sort of credit cards but that they took Visa, Mastercard, and Discover. I went out to the parking lot and called the MSC and asked the account manager what to do next, and they told me to abandon the shop. I was not paid anything for my time or trouble.
So yeah, I would definitely look into it because it sounds to me like you followed the instructions correctly and the editor may have made a huge mistake. Contact your scheduler first, and then follow up with any other contacts at the MSC you can find. Good luck.