Capital First — flipkart voucher is still pending

I had purchased a Flipkart voucer worth 8000/-
On 22 sept through instaCred, my loan amount is disbursed from my limit and Emi is also charged per month, but Flipkart voucher is still pending .
When i contacted them, there is no proper response from them, they asked me to wait untill it is activated, even they don't know when will will voucher activated .At the time of purchasing they said me it(voucher code) will be send with in 3 days, but it is more than 3 days still my voucher is pending and emi date is getting closer.
My issue is not solved due to their inefficient customer service. Please solve my problem asap..