Hi Kawal Preet Singh,
Thank you for the purchase.

Sorry for delayed replay, but our working hours are 10am - 18pm CET from Monday to Friday. The problem with Google Spreadsheet is related with your server. Probably you are using Blue Host and to make it work you just have to add this one line in file ../wp-content/plugins/wpdatatables/source/class.wdttools.php

You have to find this line:

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

and after that add:

curl_setopt( $ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);