Can I return the 30 yuan after the deduction?

I can't. Postal deduction of 30 yuan means that the SMS reminder service of Postal Savings Bank is 30 yuan/Year. If the user agrees to handle this business, the annual fee of 30 yuan will be deducted from the bank card in one lump sum. If users don't need this service, they need to call the customer service hotline of the Postal Savings Bank to cancel the business and then deduct the fee. If the business has been deducted, the money will not be refunded.