Bootees - Package not delivered

I ordered a black t-shirt from bootess.in on *th December ****. It was an online paid order. The normal shipping time is **-** days. I didn't receive any sort of shipping information in ** days. I called at their customer care but 'nobody picked'. I mailed them for my order cancellation but they said it can't be cancelled. Messaged them on Instagram they told they are out of stock I will receive it in *nd week of Jan but it didn't come, I asked them again they said we are out of stock you will receive it by *rd week of February after that if I message them they are just ignoring not responding. I didn't know what else to do so I have taken a step to the complaint against them.