Relaxo Footwear — product problem

Hello sir/madam. I have purchased a pair of flyte slipper as on 22/10/2017 from your mayur vihar outlet and i m reguler customer of relaxo for last 20-25 years. My slipper strap broke yesterday. But your outlet officers asking me for 75% value of slipper will be adjusted in next shopping. Approx 75/- i m having loss but my trust is so costly. I m very dissapointed. Either you please replace my foorware without any loss or this will be my last shopping of Relaxo. I m so hurt. Sundeep DELHI [protected].