No help after 2 weeks

Been trying to phone *** for a week no answer I was phoned by Fnb a couple of months ago and told that there was a promotion , if i opened a bank account i could save interest on 1 of my home loans , I was told that .25% was what i could be saving and that in rand would be about R 12000.00 a year on interests , I said I was interested and opened an account , one of the conditions was that i paid in R16000.00 in the first 3 months of having this account , account was opened card delivered i paid R16000.00 into account , after the second month of transferring R16000.00 I phoned to ask when i was going to get the paperwork that went along with this special , to my surprise i was told that I must have heard wrong and that i had to pay R16500 .00 into the account so i did , BUT THEN I WAS TOLD THAT I DIDN'T HEAR THE % THAT WOULD BE CHANGED CORRECTLY EITHER AND THAT IT WOULD ONLY BE .15% , I asked if the telephone conversation could be listened to and I was told that that would happen it is 3 weeks later and i have not heard from any one , in the meantime i was send the paperwork wrong at 1st i chased it for a week and then received it again right but with the .15% .