Supertech — Unwanted charges : Labour welfare , water connection , Interest

Address: Meerut, Uttar Pradesh

Hi, i have purchased a flat in Supertech Green Village, Meerut - Flat no. - F-1201, Name - Gaurav Rastogi at the time of agreement it was not told to us that there will be extra charges like - Labour welfare and water connection - and they send the demand letter with interest charges, but there is no detail how the interest is calculated what is the rate of interest . only 90000+service tax amount was remaining but final letter is of 2.53 Lakh . please check this case and remove these extra charges .