Your going to have to continue working with Pearson on this since we have no ability to look into their scheduling systems.
I am chasing them since last 4-5 weeks and they are just sending an email to check it again. Not sure to whom i need to contact now.
Moderator note: Moved to VCP
From a Google search for ERROR_VUE_WIDE_BLOCK, I found this:
Unfortunately this means that Pearson VUE has put a block on your account, this is usually done automatically by their system due to too many invalid payment attempts. To remove this block you will need to call Pearson VUE Customer Service and verify your details. The block will then be removed and you can then proceed with booking the exam, or you can ask the agent if it's possible to book the exam for you.
Here's the contact page: https://home.pearsonvue.com/vmware/contact