Spice Jet Airlines — unnecessarily delay in flight time for 6 hours and cancelation of flight without giving any alternative flights

I was traveling from bengaluru to kolkata in spicejet sg-741 on 19th april with pnr tftbsk which got delayed for more than 6 hours saying "delayed due to operational reason'". My return flight from kolkata to bengaluru was on 4th may in spicejet sg-713 with pnr yeyl3n at 8.55 am which got canceled without any reason and they rescheduled another flight spicejet sg-249 on the same date at 2.55 am with the pnr yeyl3n. Due to bad weather, airport was supposed to closed till 8am on 4th may but it was absolutely no reason to cancel the evening flights on the same day. They canceled the flight which supposed to departure at 2.55 am as well on 4th may and didn't gave any alternative direct flight to bengaluru fron 4th may to 6th may on convenient time, which is not justified. I got my rescheduled flight in 7th of may in spicejet sg-516. I'm traveling first time in spicejet and it's a really really worst experience from a customer's point of view. We are not getting the value for the money what we are paying.