OnePlus India — Tv service installation

I have purchased the tv from one plus website on dated[protected] and they are delivered that on date[protected],
After this they have installation process for that they send there engineer to our add and install the tv with help of there technician in next 2-3 working days,
So i have submit the installation id on date[protected] and there service engineer call me back on[protected] and told me that he will send technician on same day evening but he didn’t come so i call engineer but he is put my number on block lost and after that he text me that he will not come you have to call company for new engineer,
I had again submit new request on[protected] and again done same things with me now after that again on[protected] they generate new request and told me that technician will come same day but they didn’t come and now oneplus support team was not responding on any platform.

Please help me for the refund and take there product from my home