You could go to Court to complain about the running of your case, but this is unlikely to get you anywhere. Try scanning and e-mailing the documents to your IP's office in future, and then they cannot get lost in the post, and if you use a delivery and read receipt you have absolute confirmation that they have been received.
As Andy says, don't give up when the end is in sight - and there is probably a bit of upheaval in the IP's firm as a result of the takeover.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk