I booked two flights with Opodo within Thailand. OPODO *********** & OPODO...

I booked two flights with Opodo within Thailand. OPODO *********** & OPODO ***********. The flights were cancelled due to coronavirus. I wanted refunding so I rang customer services and auto message said, "due to volume of calls I would have to wait and to enter my ten digit Opodo reference number". And when I did enter the number, it replied, " I'm sorry, we do not recognise this number". Then the line went dead. I redialled and then entered my second Opodo reference number. This also was not recognised by the system and the call was terminated. I have done this four times in the last two weeks and every time it does not recognise the reference numbers. It does say in their emails that as this is a low budget airline, I should contact them directly to make changes. But when I do, they refer me back to Opodo. I seem to be going around in circles.