Tried everything — not working

Recently purchased a security camera and peephole doorbell. First off, the security camera barely worked for the first day. We were able to view live footage maybe once or twice. No incidents or motions have been recorded for days now. The peephole NEVER had any footage. It reacts to the doorbell ring and motion when I open the door — however there is no picture whatsoever So we bought a WiFi repeater and reset the devices. No improvement ... we have excellent WiFi speed... any suggestions? Thank you!