I think I was scammed

99.999999% you were indeed scammed. If you can't get the previous owner to remove Activation Lock the phone is utterly useless. Apple won't help you and we can't help you.

Read this link --> The All Too Common SAD Reality of Buying … - Apple Community

Heidi0976 wrote:

Hello I have bought an iPhone off of Facebook Market Place the IPhone I received is disabled I know nothing about the icloud account or how to reset it can you help? I do not have a Mac or PC.

contact the seller - return and get your money back. If you can't then the phone is useless.