Terrible communication causes more financial burden for customer

Ford diagnosed my vehicle middle of last year and informed me my steering pump is cracked. Had the pump replaced this month only to discover that it wasn't the initial problem. The problem is still there, but now I'm informed it's the steering rack instead. This was not communicated to me in the first place. Had I known, I would have had it repaired first. Although I visited them this morning to make an arrangement to sort the problem out, they are still charging me an additional amount for a problem I initially went to Ford for. Their communication is pathetic because they go through too many people and then the communication breaks down. I was told that's it my word against theirs and that I should have asked. This is totally unacceptable! They should be fair by informing their customers properly. Now its costing me even more.