Abysmal service from FNB and Nav Car

I have been struggling to receive even acknowledgement from FNB. After at least 10 call centre conversations, 8 logged complaints, emails to different addresses, 4 branch visits and 4 complaint escalations my issue has still not been resolved.

I have been unable to access Nav》car services for eBucks rewards since I joined FNB. My app gives me a "could not validate customer type" error. This is clearly an error on FNB's technical side of my profile, but the only advice I was given was a condescending instruction on how to add my car on the app from a Bridgitt at Nav Car (they can't even provide their full names or contact details). I obviously know how to do this and have tried (with service consultants in branch to see) many times. I have also uninstalled and reinstalled the app multiple times.

My complaint was supposed to have been escalated to a national level by the branch manager at FNB Constantia yesterday but once again I have heard nothing. This issue is costing me hundreds of rands in airtime and eBucks, not to mention the time wasted. I am at the end of my tether. This is pure disrespect.