What can I do if movers delay and overcharge delivery?

I availed the services of a movers and packers company to transport my excess baggage from Chennai to Bhubaneswar, Odisha. I was charged for 23 kgs, even though my bag weighed only 17 kgs. I paid the full amount and was assured that the delivery would be completed within 3 days. However, it has now been 7 days, and I have still not received my baggage. Upon tracking with their courier partner, Delhivery, I was informed that an additional payment is required, failing which my baggage will not be delivered. When I contacted the movers and packers company, they initially answered my calls. However, after I raised the issue regarding the delay and the discrepancy with the courier service, they disconnected the call and have since stopped responding. I have all the bills and screenshots of the online payment. Please advise on how to proceed with this matter.