Backpayment for PIP when on IVA, Dept Management took all

for PIP when on IVA, Dept Management took all Hi all, I have been recently awarded the enchanted rate for Daily Living and Mobility with a backpayment from last summer. Didn't receive the money in my bank account and after 1 months I called PIP, the agent told me to wait for the letter and advise me all is fine, to not worry. 3 weeks later ( today) , i I called again, 17 unsuccessful attempts to connect, 2 disconnects just after verification and finally after 1h and 20 minutes someone answered me. The agent transferred the call to someone else and they told me that Dept Management took all for my previous dept. Firstly, the Dept was included in my IVA, Second - don't think that I own £3000 to DWP Third - no-one informed me, not PIP, nor DWP I needed the money for advance payment for a motability car - mine is due for a MOT and to pass it would need a lot of money to service, Plus my new car insurance would be 3 × higher than now, so the logical thing is - motability car. Just now contacted Dept Management and after 15 minutes only!!! Very friendly agent answered me and told me that they REFUSED the money because of the IVA!!!! This happened on the 6th of March!!! Was advised to call back PIP to ask for my money... What is happening? Is this rude agent even know what is to wait for hours on the phone, till you can't hear and your ears are ringing? Or the problem was that their working time was finish? They answered around 4.50pm... Shame on her, and anyone like her!!! Sorry for the rumbling, needed to take it out and try to prepare for the new fight tomorrow. Hopefully will be able, hopefully my anger will keep up the adrenaline rush and the anxiety will not cause a flare up. If anyone has any advice for me for the tomorrow war with PIP, please share!!! And thanks for reading