They cannot automate that with a script - that's what the captcha's for.
Character recognition has advanced to a level where automated services can have a significant success rate.
Also tried on the hour and no luck again.
Sorry to hear that. Hope you get through soon.
There is a huge backlog of unconfirmed transactions right now. I suspect that there are probably more than 100 people that are all trying at the exact same time. Under these circumstances I'm not sure which method will be better (your method of clicking the "submit" button exactly at the top of the hour according to your own clock, or my method of repeatedly trying from a few minutes before until a few minutes after the hour). If there are 1000 people all trying at exactly the moment when viaBTC resets, then each user will only succeed an average of one out of every ten times that they try. If there are 10,000 people all trying at exactly the moment when viaBTC resets, then each user will only succeed an average of one out of every hundred times that they try.
On the other hand, the more times people fail the more likely they are to give up trying, which may increase your chances as long as you stick to it.
Good luck.