Myntra.com — roadster women white sneakers

I ordered a pair of shoes from myntra and paid online using my credit card,
Yesterday on 18th july 2019 i received a message that the order has been delivered but i didn't receive anything.
I contacted their customer service today, they said the product has been successfully delivered and i have signed it but in real i have not received it and they sent me an email as a proof of delivery and some signature which is not mine. What should i do now.
Please help me

Email that they sent-
Subject
Proof of delivery - order no - [protected]
Staff account by email (Ibs0472393) jul 19, 2019 11:19:06 am
Dear sakshi,

Thank you for contacting myntra.

As per our telephonic conversation, please find the attachment for the proof of delivery (Pod) of your order. As per the pod the order has been delivered successfully.
Please feel free to contact us for further help.

Please note : request you to please get back to us within 5 days for any disputes on the shared pod, post which the same will not be entertained.

Regards,

Roshni|myntra

Everything you need to look good