I suggest you use the hard way to deal with these type of people. Just threaten them that you will report them to KPDNHEP if they don't provide you the receipt.

Soft doesnt work, then try this if they still dont provide.

But goverment website so in Malay haha if tak faham malay then a bit susah.

https://www.kpdnhep.gov.my/en/consumerism/c...protection.html

Consumer Protection Act

Section 140. Receipts
(1) A person who supplies or offers to supply any goods or services shall provide the consumer with a receipt
for any purchase of goods or services exceeding the prescribed value.
(2) Notwithstanding anything contained in subsection (1), a consumer shall be supplied with a receipt for any
purchase of goods or services if the consumer so requests.
(3) A receipt issued under this section shall contain the following particulars:
(a) the trade name and address of the supplier;
(b) the date of purchase;
© the amount of money paid for each item of purchase;
(d) the total amount of money paid including a separate statement of any amount paid as tax;
(e) where applicable, the make and model number of the goods; and
(f) any other particulars as may be prescribed in the regulations.
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(5) Any person who contravenes this section commits an offence