Trendin.com — Not picking up the returned item

Address: Bardhaman, West Bengal

Website: www.trendin.com

I have ordered dress for my kid from online shopping "trendin.com" vide order no is 712141 dated 9th September 2015 and 705615 dated 6th September 2015. I have to return the same due to size issue but they are failing to pick up the same for last one month. Several time I spoke with their customer care but they are not able to resolve the issues.