We bought a combo ticket that included the trainride from Nong Khai to Vientanne treinstation. And from there we had a small minivan from PTS that would transport is to the big bus on the outside of vientanne where more people would hop on.
First of all the train was 1,5 hour late, so the people at the trainstation where very helpfull and made some phone calls. They told us to take a taxi to the border get a signout stamp from thai border control and buy bustickets to transport you over the bridge into Laos. Once there get your visa, take a taxi to the trainstation to be on time for your bus.
We did all this and when we came in the trainstation, there is no PTS counter, the people who work at the station are very kind and strated making phone calls to the number provided on the voucher, but no answer. Finnaly a man came Walking to us that was the driver of PTS and he told is we had to wait for the train as there was 1 more person that would come with us.
After we waited for 1,5 hour the train arrived and we waited 30 minutes more for everyone the get a visa.
Then the minivan driver drives us to the big bus, where we waited more 45 minutes because other people were late also.
In the end of has nothing to do with 12go. But the fact they did not answer the phone worried us all.
In the end it is better for your money to buy a big bus ticket in Nong Khai or Udon Thani. This is about 180 bath cheaper. The bus ticket from Udon to Vang Vieng will cost 320 bath. We paid 500 bath in 12go from Nong Khai.
And in Vang Vieng a big bus ticket can be bought for 350 bath to Nong Khai, and we paid 12go 450 bath.
The minivan was terrible ride , very old. No airco and the dust and sand comes right trough the holes and cracks of the van. Not good for your health , so bring face breathing dust masks