How to get the refund in Hochinmih from Jet airway company?

Jet Airways started their operation in Vietnam last year. They fly from HCMC to Mumbai via BKK on a codeshare agreement with VN Airlines.
A codeshare agreement, is an aviation business arrangement where two or more airlines share the same flight.

Since more than one parties (Airlines) are involved in this deal, refund could get delayed. My assumption!
On top of that, transfer of money both in and out of Vietnam and of India is highly regulated.

You can try the following options:
- Contact VN Airlines office in HCMC and see what they have to say.
- Contact customer service of Jet Airways, Mumbai, directly (+91 22 3989 3333). This is their head office.

Jet always drags its feet when it comes to refund even within India. Average time for refund for a domestic E-Ticket is 10-30 days. Rarely they process it faster. For overseas refund it could take longer, especially where another stakeholder (VN Airlines) is involved.
Expect some deductions (by different parties) when the refund finally arrives.

Jet doesn't have any representative office in Vietnam. They only have a Sales Agent somewhere in D1, HCMC.
See if you can persuade that Agent to push Jet to expedite your refund. The agent might charge a small fee (commission) for that.

That's the reason I always fly with Thai, although bit expensive. So far, I never had problem cancelling or rescheduling my flights from Hanoi or HCMC at a small cost (sometimes free of cost).