Can someone help me asap with this matter, the car lot messed up and now I am in jeopardy of them repossessing the vehicle and losing my money down.

On March 1st my husband went to the lot and the original agreement was 2,500 down for a 2014 Traverse and the notes would be 203 a month, with first payment being made on April 7th. Well the finance manager told us in order to complete the deal we would need to do a total of $3,000, which we didn’t have at that time so he said he can work the $500 balance off. On March 22nd my husband was able to send them $150 so in total we paid them $2,650 in total on the down payment. Well the April payment came and I called them to ask how to send the car note and the finance manager stated the lien holder aka finance company backed out the deal because my husband account is in a negative balance at the end of each month. So, now I am afraid that we are in jeopardy of losing our money and vehicle which I told him and he responded to just pay the $350 balance and he can try to redo another loan through another financial company. He told me he will give me a call back by the next day which should have been April 8th and it’s now April 12th and we haven’t heard anything from them yet. I am needing help on what to do now if anyone can provide assistance I would greatly appreciate it.