FordSa bad warranty worst service

Bought my ford ranger 2.0xlt 4x4 in 2019 brand new loosing power with no warning indication.the day after i bought it i called the salesman he said it might be the key switched it off and start again the vehicle is running normal again, since 2019 i had this issue took it to ford Germiston can’t find the problem they said its software update. Took it back in 2021 for the same reason with my service they replaced a sensor called pressure sensor, drove the vehicle mostly it town went away in April 2022 same problem again took it back to ford Germiston May 2022 with my service and the same issue they can’t find any problems. Done 2000km until Oct 2022 now i just had enough said to them I’m bringing my vehicle in i want it to be fixed its been 4 weeks already i eventually called FordSa to see if they can be of any assistance or maybe they had an issue like this before, the send out a technician after a week they let me know that is not a warranty claim because i fitted a 4x4 bumper and the bumper is causing the issue , so i pulled the invoices i had my vehicle at ford in May 2022 with this issue fitted the bumper in July 2022 and took it back in Oct 2022 that doesn’t make sense but this is an easy way for Ford to get out of a warranty because they can’t find the issue. And the service from FordSa is pathetic they call you every day before 5pm and if you have a question they can’t answer me they need to find out from the technician i said mails don’t get any response only phone calls. So if 1000s bakkies fits bumper do they all loose warranty??i don’t think so. Ford can’t find the issue on my vehicle and this was just a quick way out for them.i can’t see why i had this issue and now all of a sudden it the bumper.