Adidas — Exchange of product

Address:

Adidas Forum Mall, Kukatpally, Hyderabad-500072

This is in regard of return/exchange of Tshirt bought from forum/Nexus adidas store, kukatpally hyderabad-500072, Telangana, I have purchased 2nos Tshirts on[protected] form the store and i have went 3 days later due size issue for exchange of product, but the executive there told that manager is not available and will come after an hour, i think the time was around 11Am and he informed that to keep product with them and i gave and left. and after 3 days again i went back regarding exchange and the same process repeated the manager is not available and i requested executive to inform when manager is available he told will inform after manager comes, days passed and nobody called and later after 1 month again i went but the same repeated and i have asked for credit note also but the executive said its not a problem and now recently 4 days before i went to store and asked but the manager is refusing to exchange the product. I am seriously disappointed with the careless attitude and irresponsible behaviour form store staff associates and they are least bothered to atleast informed over call when i have made attempts for exchange of product since the product is available in store itself.
Can you suggest me future course of action from your end here or let me know if i should have take it with any grievance teams, i kindly request to resolve this issue.