Select Portfolio Servicing Exspenses paid by servicer not documented Internet

Hello, I currently have an account with SPS or BKA Select Portfolio Servicing Inc. . My account was originally with another local bank in my area. After my divorce, I could no longer afford to pay my mortgage on time and my accountant was forward to SPS. Foreclosure was pressing. However, thank you JESUS ... I was able to get out of foreclosure  through the HAMP program. From what I was told, all of my in the rear mortgage payments and other LEGAL fees were included in the modification and added in my mortgage payments. Well, I noticed that there was a $748.65.  I asked about the fee and I was told it was lawyer fees that were added as a result of the foreclosure fees.  Lawyers fees .... What? I asked why they were not included with the modification along with the other fees. SPS rep/supervisor said the fees were received after the modification was made.  Not only am I having to pay the $748.00 am being charged INTREST. Then I asked for an invoice showing that this charge was in fact LAWYER fees  and I  told that they aka(SPS) could not give me an INVOICE.  I guess Im supposed to take their word for it and be charged interest on top of the fees. Is this LEAGAL?
Sj33....FL