PayTM - Package delivered fitting issue as well as cash back not received

I ordered a puma Dp running shoes . Which has been offering a **% cash back I ordered due to that . But later on pay TM refused to pay **% cash back . I asked for return in that case also neglected on account product is non refundable . Therefore a complete Nexus of exploiting customer as they received payment in advance & customer having no other options . I complaint several times but they are offering only **% cash back . Organisation this kind of fraudulent activity should get punished...