Rectification in already registered sale deed for flat in ahmedabad

I have a flat in Ahmedabad which was registered in the registrar's office in Ahmedabad ADH-10-vjr on [deleted]. The flat A - 702 is correctly mentioned in the Registered Sale Deed however there is a mistake from the builders side in mentioning the adjointing flat numbers.This document is in Gujarati. The directions are mentioned as under : East :- Society Road, West :- Flat No. A - 603, North :- Flat No. A - 601, South :- Flat No. B - 603. The correct description is mentioned in the Registered Agreement to Sale in English as under: East :- Society Road, West :- Flat No. A - 703, North :- Flat No. A - 701, South :- Flat No. B - 703. I & my daughter who is the first owner cannot read Gujarati hence when we signed this sale deed we did not realise there was amistake in the document. Moreover, because it was to be the exact replica of the Registered Agreement to Sale made in English because we insisted on the same. We want to rectify the mistake without paying Stamp Duty again. 1. What are the step to be followed. 2. What is the time frame required to accomplish this job? 3. Will we have to approach the same Registration Office for the rectification? 4. What are the fees/charges to be paid and to which authority?