Mr. Fit (www.mrfit.in) - Size issues

I purchased a slimming belt on **rd June. Order no. *********. The site offered * on *. The size that I opted was **-**". I recd the parcel as per the given schedule ( **th June ** )and paid Cod of rs. ****/- . I immediately messaged saying the size is too small I would like a refund. The phone number +************ /+ ******* ***** given on the web site did not connect. I tried couple of times. After a ring the phone gets disconnected. I read the return policy on the web site, it says refund possible only within ** hrs if communicated. I have mailed them next morning promising to take a strict action if no response. It's been a week above no communication has been exchanged. I would like to apply for a refund since the belt is of no use to me, given the size is small.