Flipkart — Delivery delayed and rescheduled

Ordered an iPhone se from Flipkart on BBD sale. On order day(i.e. 16th oct) promised shipping date was 17th and delivery day was 20th oct. On 17th oct the promised shipping day was changed to 20th oct n delivery day to 25th, due to some "unknown" logistics issue. But on 20th "the unconditional shipping day" they again changed that promise day to 1st november.

Called Flipkart consumer care, they were unable to help me with this, they can not provide priority delivery even thought I'm a "Flipkart Plus" member and told me to wait for 1st nov.