Xiaomi India — Order canceled automatically

I ordered a phone( Redmi note 10s) from Mi.com on 15th January( during midnight it was republic day sale) and i paid the full amount that was applicable during discount. And at that time it was showing order will deliver within 3-4 days. But after 5-6 days I didn’t receive the phone. Then I did chat with their customer care and they told “due to huge volume demand order will get delayed and will be shipped after 27th January “ . Firstly i was disappointed with this delay delivery but today they automatically canceled my order without my concern. Though they refunded my money but the republic day sale is over. At that time i can buy the similar phone on other e-commerce sites like flipkart and amazon. Now price is high everywhere and i feel cheated from xiaomi. Please do take some action against them. Thank you!