Cannot add voicemail feature as 'order currently being processed.'

[#1]

Hi trying to add voicemail to my account, however the option to add this feature is greyed out as I can see the following status message:

"Unable to change service

You can't change your products for the moment, you have an order which is currently being processed. Please try again later."

What do I need to do to update the order status (I assume I will be able to add the voicemail feature then).

Thanks in advance.

[#2]

I have joined the forum because I also have this issue. Rather than start a duplicate thread, I thought I would add to this one.