Reebok Walking Shoe Model J08630 — starts paining in legs and thighs

To
The Manager
Reebok

I have purchased one pair of shoes model no.J08630 size 7.5 for Rs.3919.30(sale price) and actual price was Rs.5599. Bill No.884 dated 11.2.2010 from G.N.Overseas,Unit no.G-2,G-3, Manish Corner Plaza, Plot no.1,Sector 11,MLU pocket dwarka,new delhi-110075, Tel.No.45018615 and 16. I was told that this is very good for walking,specially recommended and certified by the doctors and it gives pain relief in knees and ankle.
I am a regular walker of 8-10km. daily and I never complaint in my legs and knees. But after wearing this on th first day,it starts paining in my legs and thighs. I tried on second day and again it starts severe paining in the legs as welll as in shoulders.
Kindly make arrangement for replacement or money refund.

Thanking you in anticipation

(Kanan Khera) Tel.no.[protected]