Tanishq — Golden harvest scheme

I’m on a golden harvest plan with Tanishq, the last instalment was paid by me on dec 8 and the same has been deducted from my account but yet I get notification regarding unpaid instalment for this month . I had initially followed up with the customer care number they initially said it will be refunded within 7 days but it never did then again I followed up with them, then they said in some getaway it is failed but once they raised a ticket it will be refunded and they raised a ticketTKT-[protected]
It’s more than 20 days I haven’t got the money back neither any answer from them . Then the customer care guys said the concerned team will get back to me but they never did . Then I wrote a mail to them also and an auto generated mail triggered saying some new ticket is generated TKT-[protected]. I never expected such delay and even inconvenience from a brand like tanishq