Hi Neverguess and welcome to the forum. Also a Happy Easter!
On the basis of the facts you have provided, your IP is wrong in taking your expenditure back to that presented in the IVA 3 years ago. This just doesn't make sense, and firstly I suggest you speak directly to the IP to get him/her to explain. It seems to me that this decision has been made by a staff member rather than the IP themselves. If this fails write them a stiff letter. In the meantime, calculate the level of payment which you can afford and continue to pay these over. Can you afford to make payments at least at the level of your original IVA? If not, then the IP will need to propose a variation by calling another creditors meeting.
Do not even think about bankruptcy at this stage - if all else fails you can now take the issue to the Financial Ombudsman to look into or the IPs own regulatory body. I rather suspect that this will not need to happen, when you manage to speak to the IP themselves.
Do be sure to let us know how you get on!
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