Employee of Capitec giving out personal information of other clients

I received money in my account on friday 17/09/2021. later i received a call to say the funds (R500) was sent to my account in error and i need to send it back. i advised the caller i only have cellphone banking and the is no option to send money , i will send them their money back when i get a moment . On Sunday 19/09/2021 i received an sms from the sender, they knew the name of my employer and address , they threated me they were going to report me to my employer if i don't send them their money back. Please investigate who went into my profile and gave this client , my personal details as he new my employer and my address .