FNB AND THEIR POOR SERVICE!

I am currently swapping my home loan to Nedbank from FNB. I have given them a 90 days cancellation notice so as to NOT incur any interest to cancel the home loan. My home loan is ready to be registered with Nedbank, but FNBs cancellation attorneys are requesting for 2 MONTHS INTEREST ON MY CAPITAL BALANCE UPFRONT! . ONCE AGAIN, I HAVE GIVEN A 90 DAYS CANCELLATION NOTICE PRIOR TO CANCELLING THE HOME LOAN! The cancelling attorney is REFUSING TO PROCEED AND INSISTING THAT I REQUIRE THE MONEY. FNB, SORT THIS OUT!