Nokia India — too much delay in repairs

Myself akash. I belong to kerala state, palakkad district. I've purchased nokia 5.1 plus [ imei ; [protected]] on 19th of march 2019. On 19th of september my mobile got damaged and i took it to nearest authorised service centre (Agnus flex care, palakkad, mob no : [protected]). They told its water damage and i've to pay for it, and i agreed and they committed to complete the repairs on or before[protected]. On the day when i contacted them they asked 2 more days time and again i agreed they asked time again and again. Now its october 10th and now on this day when i contacted them, they aren't responding properly. Now they are still saying the same reason!!! In 6 months time this is the third time i'm taking my mobile for repairs. And for every repairs they need minimum of 1 week time. And this time they're taking 20+ days now and still not repaired. Not at all happy with the product as well as customer care service. Kindly help me in solving my problem. My contact number : [protected]. I hope help will be provided as quick as possible...