It must be bank policy since your policy is in violation of Mastercard Transaction Processing Rules regarding prepaid cards.
4.14 Mastercard Manual Cash Disbursement Transactions
In the U.S. Region, the Rule on this subject is modified as follows: Subject to compliance with the Standards, each Customer within the United States Region must provide cash disbursement services to all Cardholders at all of the Customer’s offices where teller services are provided.
4.14.2 Maximum Cash Disbursement Amounts In the U.S. Region, the Rule on this subject is replaced with the following:
A Customer and each of its authorized cash disbursement agents may limit the amount of cash provided to any one Cardholder in one day at any individual office. Any such limit must be uniformly applied to all Cardholders of the same Card type. With respect to prepaid Cards, the limit must not be less than USD 5,000 per Cardholder in one day. With respect to all other Card types, the limit must not be less than USD 1,000 per Cardholder in one day.
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