AFNetworking post request fails due to nsdictionary value with double quotes

Question

When I set nsdictionary as request parameters, dictionary values with special character are added with double quotes and that cause the post request to failed but when I use same dictionary values using "Rest client (Chrome Add-ons)" request post successfully. How to fix the issue?

for example lat and long should be float value because of special character double quotes are added automatically. Here is my NSDictionary log->

**

AptSuiteNo = 20;
BuildingName = "the ";
BuiltInYear = 2014;
BuiltUpAreaSize = 200;
CityName = Dhaka;
CountryName = Bangladesh;
CreateDate = "19-04-2016";
CreatedByCompanyID = 7746;
CreatedByUserID = 7915;
CurrencyID = 1;
Description = "The ";
LastUpdateDate = "19-04-2016";
LastUpdatedByUserID = 7915;
Latitude = "23.832637";
LocalityName = Cantonment;
Longitude = "90.416590";
NeighborhoodName = "Nikunja 2";
PlaceID = ChIJieh0al7GVTcRvMjqALwGYVc;
PostedBy = owner;
Price = 200;
PropertyBathroomNumber = 1;
PropertyBedroomNumber = 1;
PropertyBuildUpAreaSizeTypeID = 1;
PropertyID = 0;
PropertyLotSize = 250;
PropertyLotSizeTypeID = 1;
PropertyName = "the ";
PropertyTransactionTypeCategoryID = 1;
PropertyTransactionTypeID = 1;
PropertyTypeID = 10;
StateName = "Dhaka Division";
StateTicker = "Dhaka Division";
ZipCode = 1229;

**

NSMutableURLRequest *request = [[AFJSONRequestSerializer serializer] requestWithMethod:@"POST" URLString:RequestURL parameters:[self requestDataString] error:&error];