I understand your frustration, still, I will implore you not to jump to any conclusion yet as the fault may be on their part or on your part. Gadgets/programs and internet services could be funny at times, and this might be from you or them, it will take a lot of repetition for you to make your conclusions.
No one is at fault here, there was no bug, and the systems worked as they should have. OP probably doesn't understand how live betting works because if he did he wouldn't find it unusual that it takes several seconds for the sportsbook to verify the results before accepting or refusing to accept a bet. Even closed markets are normal and it happens regularly in all sports. Especially if we are close to the end of the match or a significant point that can determine the final result.