How can I change the change the spam detection setting on a Samsung Galaxy Edge 7?

Hi, I like the idea of having spam detection for incoming calls. However, I have found that it is a bit 'overprotective' and only rings once before blocking a call. On several occasions, I have been expecting a call back from a company only to discover that they tried to call me but could not get through.

I generally haven't known their phone number beforehand so I haven't been able (nor do I want to) add them to my contacts first. Can I at least change the number of times it rings so I get time to answer it? I don't think they get the option to leave a voicemail message.

Any suggestions would be welcome. Thanks.