Cashe — Harassment by recovery agents

I took a loan from Cashe and paid all EMI before due date. Only one EMI left. Now recovery agents are continuously harassing for repayment. They also hacked the phone contacts illegally and calling every contact and asking them for money using abusive language and threats.
They continuously harassing and mentally torturing me and my relatives. Doesn't talk without threats and abusive language.
Who gave them right to data theft and hacks? I lost the job due to such calls from recovery agents to my employer.
I already complained to their customer support but nothing changed. If they don't stop, we need to take some legal actions soon on field of defamation, data thefts, identity hacks and threats and harassment.

Especially from this number [protected]. Continuously calling contacts and defaming me and harassing the contacts in phone