In which case I would definitely ask for a breakdown of these so that you understand exactly what is being charged. IPs are allowed to charge various items of out-of-pocket expenditure to an IVA case, but these must be properly disclosed within the IVA proposal, discussed with you in advance, and some of which do need the express agreement of creditors to charge them.
It is a shame that your perception of the firm acting for you is not so good, especially as you must have had good reasons for selecting them in the first place. If you feel the need to speak directly to your IP to express your concerns, then this is your right and I am sure he/she would want to help where they can.
The firm concerned are members of the trade association DEMSA, which requires very high standard to be maintained of its members, so I am sure you will eventually get this matter resolved to your complete satisfaction in time.
Regards, Melanie Giles, Insolvency Practitioner