TVS Credit Services Ltd — blocked my phone without intimation

Hi this is suresh i have purchased samsung galaxy j6+ and i have completed all emi but they said that i have bounce charges of about 1300
I said i will pay this asap but after that tvs block my phone without intimating me i scared because my details is available in that phone ie bank accounts, mails, official detail, and all other personal details. If they didn't unblock my phone i will file case on to them misuse of my personal details. So resolve the issue.