Bad customer service

I app**** for a credit card on the 28 August 2019 and until today my application had not be resolved. After I app**** for a credit card and got an sms that my application has been provisionally approved. The sms requested that I send my documents so my application can be finalized. I sent all my fica docs and my payslips as requested and I received an email from Nedbank indicating that they received my docs. To my surprise I got an sms saying my Nedbank credit card account application has been declined due to incorrect or unauthentic details provided. I contacted the bank and I was told that they could not get hold of me. It also came to my attention that they were using incorrect numbers to contact me which I do not know where they got the information from. My biggest worry is I keep on getting sms from the indicating that my application has been approved and bank requesting my documents after they indicated that my application has been declined. I am worried that my personal information may be in the wrong hands.