Post Form E - Reluctance to engage

I'm the respondent in the divorce proceedings.
We have exchanged form E's.
​​​​​​Petitioners Form E was submitted without a signed statement of truth (via their solicitor).
​​​​​The signed statement has been requested multiple times, but it would appear the Petitioner is refusing to engage with their solicitor.
Their Form E and supporting documentation is incredibly contradictory. I won't go into details, but what they state in the Form E is not reflected in any possible way in the supporting documents supplied.

The questionairre has been completed, and the Petitioners solicitor has been asked for a date to exchange questionairres.
I am prepared for further financial disclosures and will respond to any questions relating to my Form E and Finances accordingly.

My questions:
What happens if the Petitioner ceases to engage with their solicitor?
Would/could the Form E already submitted by the Petitioner, via their solicitor with the unsigned statement of truth, be used in Court?
Would/could a Judge make an Order for compliance from the Petitioner?

I desperately wish to apply for the final order of divorce (as this option is now available to me due to the time that has lapsed). I wish to be freed from this nightmare, but dare not submit the application, until formal processes have concluded.
These questions are my attempt to minimise the stress caused by the Petitioners relentless games (it's been 20 months already)!