Hospital might be able to sort an extension for you have a medical basis, or something. However, they may want to admit your whole family and make you pay for it.
Many places have a ฿300 minimum for cards, attract a poor exchange rate and service fee to accept foreign cards, the 3rd party verification service rejects your card, or “the machine is broken.” Pay for hotels on Expedia or similar, bring cash and exchange for baht.