I have had some horrifying experience with my smart home loan account with HSBC - I uncovered the mistakes about 3 months back when:
I suddenly realized my balances were reset to 0(I had some 20K of hard earned money in my account - because of which couple of my cheques bounced), outstanding principle was set from 27L to about 7L for no reason. Monthly tracking of interest is available online in their website but not the principle component.
So far I have uncovered atleast 10 cases of mistake where I have been asked to pay about 15K more than the usual amount I should have paid and about revisions in my home loan repayment schedule about 5 times of which 3 has been because of changes in HPLR for the bank as regulated by the RBI & others because of carelessness of the bank.
I would advise each and everyone of you who has taken a smart home loan with HSBC to understand the product and make sure you see the monthly cash outflow towards your principle and interest component.
After regular followups and chasing customer support from the branch for about 3 months - all my accounts have been corrected in terms of my payment and everything looks okay now. Even their customer service over phone is pathetic(they have no clue of what the customer wants before they send their responces) and not everyone in the bangalore branch is smart enough I had to take it to a manager in the branch before I was assigned a senior resource to handle my case and she did a very good job out of it.
My recommendation is to please check your accounts regularly and if your bank allows you do a full revamp - look at payments from the start of the loan.