The app shows you what you’re about to order. If they accidentally sent you Maestro while you’ve ordered a Mastercard, it might be a little late to ask support for a refund. Next time, I would talk to support right away.
You can also check the price list regarding free cards. The standard is that only the first card is free. Shipping fees apply. There were several promotions where new users could get free cards including free shipping, but I don’t think such a promotion is currently happening.