Punjab National Bank [PNB] — Miscommunication of interest rates

I am a customer of PNB housing loan from 11/2020, initially i was told i will be given an interest rate of 6.9%, but i received a sanction letter with 7.25 interest-rate when asked the respective branch manager said he is going to get this rectified, but inspite of repeated followups for more than 18 months they couldn't get the rate rectified. now this month citing repo rate increase they have increased interest rate to 7.65% on 01/06/2022 and on 07/06/2022 they again revise the interest rate to 8.15% when i call the branch manager he is unwilling to even answer why there is an revision in interest rates.

now i want to move away from PNB which also they are not giving necessary documents.