1099 R

I have invested my 401k money in Real estate trust via Custodian. The real estate company bankrupted - Now my custodian keep charging heavy fee for the bankrupted company.  I have closed the account so Custodian company sent me 1099 R shows on box 1 and 2a same amount( e.g $100k) however they also checked box 2b taxable amount not determined and put code 1K- if I Do not change amount of 2a I have to pay almost 25k in taxes plus 10% of penalty of the money which I never received - Custodian comapany say once you close the account we can not change and send you new 1099R- How to use this situation so I Do not pay taxes ( almost 35k) on the money which I never received( I received $0)