irresponsible act of FORD caused me lot of money to fix my Vehicle

2 months ago i took my Ford Ranger for service at Allen Joss in Wonderboom and told a service Consultant that the engine light was on and it went off and he told me that when he was test driving it he didn't experienced any problem with it and i drove it for less than 10 000km and the car was broken ,i was told that chain broke and it damages crank and other staff and it cost me over 43K to fix itford at the same Allen Joss Dealer .i was told that it was wear and tear and that previously they used to replace chains at 150 000 km and FORD gave a directive that they shouldn't replace at 150 000 anymore.If i knew and advised i should have changed the chain on 150 000 and it was going to cause me less that what i have paid.