For Android users, itās quite simple to record calls and save them without using an external, money-costing service; at least, it was when I set it up several years ago to put pressure on a shady car dealer.
I used the app Easy Voice Recorder, which includes a Tasker plugin. I set up Tasker to automatically record calls to and from specified phone numbers.
If you donāt want to be sneaky, itās even easier: just call the person, tell them what youāre up to, and start Easy Voice Recorder. Other apps will probably work just as well.
It wonāt work on some devices, notably HTC and some Huawei phones, but if youāre rooted, it shouldnāt matter.
Iāve used ACR and even bought to pro version, in case someone doesnāt want to use Tasker. Itās worked reliably for me most time, although sometimes a file has corrupted on occasion.