Siwell Inc Mortgage Complaint

Siwell Inc Mortgage department,

Conventional fixed mortgage Loan servicing, payments, escrow account California

I purchased my home -, 2012 with a fixed mortgage loan. It appears that my original loan had an error my property taxes were calculated by 1.25 % and should have been 2 %. My mortgage company has paid my taxes in full, however I have a -escrow balance that needs to be paid off in 12 months of over $300.00 additional per month to my loan. Is it my burden for their error in calculating my loan docs. There has not been any increases in my property taxes or insurance premiums.