Wesvaal blunder, now excuses.

I have a citroen 2006, out of warranty etc. Had a cutting out problem with the vehicle. Took it to Wesvaal motors Nelspruit for diagnostics. After that they said the injectors needs replacement. Paying R25000 for new ones was above my budget. I imported OEM Bosch rebuilt injectors. After sending the dealer the injectors the problem started. First the injectors was not right for the vehicle according to the Technician but it is the same bosch injectors that came out and are prescribed for the vehicle. I then sent the injectors on my account to Northern Diesel Injection for inspection and testing. They informed me that injectors was burnt and started to rust not due to wear on them but due to contaminated diesel. I questioned it with the dealer, they informed me that they did not deam it necessary to flush the system due to the vehicle drove in, but i had it towed in due to not driving more than 100 meter at a time. Now after lots of emails up and down their excuse is that the vehicle will only be repaired with original citroen injectors and that it will not run on other injectors and that I had to pay for it. I would like to know, what about the money I spent so far and who is telling them this stories and lies. I think their Technician messed up by not flushing the diesel system or cleaning the injection areas before commencing the work. There is only one way the dirt got into the system, workmanship error. I hope they sort it out otherwise I will have to go the attorney way..