I have submitted multiple requests with regards to this question. ALL our blocked numbers under the Super Admin has disappeared. The first time, they have re-added it for us which was fine. Since then it has happened again and now they're asking us to add THOUSANDS OF NUMBERS to the Blocked Numbers list in the Super Admin extension. It would be fine if there's a mass add function where we upload a CSV and add all the numbers found there but no, we have to go page by page and add them. 

I contacted them again last month and again today but apparently there has been no movement from the engineering team with regards to this problem. It is a serious problem if call blocking is not stable.