Clientele Perks is a sham

“Clientele Perks” sales people approached me at the shopping centre trying to sell me a rewards programme that offers free discount vouchers and cash back. I downloaded their app and created a profile. They then asked for my bank account details so they could pay me the monthly cash-back and I was hesitant, but they said they wouldn’t debit anything without my permission, so I believed them. The guy helping me then took my phone to “check” if everything is okay, little did I know that he was trying to accept a debi check. Luckily, I grabbed my phone to see what he was doing and managed to reject the debi check before he could press 1 to confirm it. After that I told him I wasn’t interested and it’s very shady to accept debi checks on behalf of someone else under false pretences. He re-sent the debi check and BEGGED me to accept it, even if I cancel it immediately and I refused. I told him I sent his picture to my partner already, in case he tries something.