The seller or holder of a retail installment contract must give the buyer a written receipt for any payment made in cash. Upon the buyer’s written request the holder of a retail installment contract shall give or forward to the buyer a written statement of the amounts of payments and the total amount unpaid under the contract. Upon written request, a buyer is entitled to such a statement once every 6 months without charge. The holder may require payment of a reasonable charge not exceeding $10 for each additional statement furnished.