Creditors are entitled to charge contractual interest up until the date of your creditors meeting.
The amounts paid to your creditors ought to have been included in your IP's annual reports and his/her final report of which you should have been provided with a copy.
In hindsight, it is hard to undertand the logic behind you being advised to enter into an IVA with relatively small debts for such a high cost in proportion.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
To have me propose an IVA for you, please visit:
http://www.melaniegiles.com/ivaEnquiry.asp
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http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp