I didn't hit my tax bracket and got emergency taxed which means the money I was taxed was my disposal income in the first place and it's 500 am I not entitled to claim that back
Entitled to claim that back from who ? If you have overpaid tax then HMRC will refund the overpayment, or adjust future tax by amending the PAYE coding.
Any refund might then be due to be paid over to your IVA, in theory, as, if you were taxed correctly your DI would have been more each month and paid into the IVA anyway.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014