Cheated! less than 48 hour repair

I took my vehicle to Bosch Durban branch @Florence Nzama (Prince Alfred) street on the 27th of January 2015. My vehicle required a service and for the power steering to be fixed. The steering had gone stiff. The vehicle was checked on first visit and it was said to have a problem witih the circuit board due to moisture and corrosion collecting on the board and relays. Bosch therefore cleaned up the relays resulting in the steering being back to normal. The clean up was the solution to the problem i was having and i drove away assuming that all was in good order. in less than 48 hours the steering went stiff and that means the problem was not resolved. The steering went stiff one moment and back to normal the next. I immediately contacted Bosch and informed them of this. I then later took the car back in on the 11th of Feb and they advised that the circuit needed to be replaced and that the cleaning job that they have done was not sufficient. I didnt have the money to continue with the replacement so i took possession of my car. The job that i had paid for initially was not completed nor was it effective and therefore it will correct for me to have my money back.