I work for the land registry. I can't give specifics/legal advice.
If you think the charge should not have been removed, write/email us to say that you think it was removed erroneously and that you object to the removal. Use the word object.
This will put a marker on your title and means that any apllications (sales etc) that come in after it cannot be processed until your application is dealt with.
However, applications are dealt with in the order they come in. If there are already applications pending, then your objection should be considered with them but might not be.
Your best bet is to phone up and find out if there are any other applications already on there and tell us that you object to those too. You'll be told to put it in writing but it should be noted.
We are striking on Wednesday and the phone lines are likely to be closed so do that today/tomorrow.
The charge won't have been removed without evidence. If you don't think that evidence was correct, then tell us why.
We have backlogs ATM so unless there is a reason to expedite any sales, you probably do have some breathing space.
We send out thousands of notices/letters
each day. 99% of them are sent as normal post. We will have a record we sent it.
Is your address for service correct on the register? It isn't our responsibility to keep that up to date. Not much use to you now, but if you do send stuff like that, you need to make sure it's actioned.
But yes, it's often easier to deal with a lawyer used to our processes.