Hi, here's what happened in the end. We managed to get thru on the phone to someone at immigration, they said it wasn't recommended at all to apply for Thai wife visa, and it wouldn't be quicker anyway. Told us to come at their office in BKK to cancel the current visa. Got there, front desk lady told us to cancel we needed to show 400k in account .. we don't have that lying around so paused for a minute... Then went back inside and asked to proceed to the officer anyway ... When got to the officer he said : no need to cancel as you just get out the country and don't use it, it will cancel itself.. I showed him the answer from the embassy in Cambodia insisting clearly in having it cancelled first ????... He said 'let me check'. He came back in and said 'oh yes actually have to cancel'. I explained I didn't have 400k in my account, he said "don't need"...Asked him to cancel, he looked at my visa and said: it was issued in Chonburi so you can only cancel it there ???? Went there yesterday, had to write a letter and give copy of passport + passport, 30mn later it was cancelled (they give you 7 days to leave). I shall now be able to apply for non B ..