Who can test the API in the Beeline cloud PBX?

Question

API

Dear, who has experience with the Beeline Cloud PBX and has access to it!
Help test the /vc/question
feature This feature creates a poll-type voice campaign.
Previously, everything worked correctly, but for a month now it has been giving an error 400 Bad Request OperationError
I am doing everything correctly: I load the audio file, set the parameters in the CURL request.
What exactly is the error is not clear. The description of the error reads - An error occurred while performing the operation. Not one bit informative.
At the same time, a similar function /vc/message (a voice campaign of the "message" type) works correctly, returns 200 OK and is executed as it should.
For me, it is 90% obvious that this is a breakdown on the Beeline side, but all of a sudden, all the same, I have a jamb somewhere (although where would it be?)
A parody of the Cloud PBX support has been unable to say anything in essence for more than a month, it only answers "your application has been accepted, please wait."

Answer 1

You should have your own manager there - resolve the issue through him. You pay them money. And support, he very often cannot help