Eureka Forbes — No proper response from Eureka forbes

Hi team, I am following up with eureka Forbes for Aquaguard water purifier water service. I have renewed my annual maintenance contract as well. Still i did not get any proper response from company about mandatory filter service. I was following up from almost 6 months for various service requests raised through mobile app and customer helpline number. Same is escalated several times but still my complaint is not resolved yet.
I hope to get my complaints resolved at earliest. Attaching the copy of invoice here for annual maintenance contract.

Thanks,
Kedar