Call log is only recording 502 calls. More than that is getting deleted.

As the title says, if there are more than 502 call logs, the oldest call log will be deleted.

I used sms backup to restore the call, after some time past 502 call logs are stored. Rest are deleted.

Any way to solve this? I have lost more than year worth of call history!

Tried third party app but they are showing past 502 calls only.