C++Beginner Programming Assignment, Need help missing one step here cannot figure this out

Project Directions

Project Directions cont..

Ok everything is working for me on this project besides when I try to input how many gb of data I went over this is the error I am getting once I run my program.

Code Error

Here is my code, I think my project is complete besides figuring this step out I have no idea why it's not working. Thank you in advance for any help guys, I always am using your site for information and this is my first question!

Below is my code

#include<iostream>
#include<iomanip> using namespace std;

int main() {    int numPhones;  double extraData, billTotal, phoneTotal,
dataTotal = 0, eDataTotal, taxTotal, roundedEData;//extra totals to
add them together at the end for total bill     char dataPlan;  const
double tax = .1025;     const int phoneCost = 20;

    cout << "How many phones are on your plan?";    cin >> numPhones;

    cout << "1. 1GB=$20" << endl;//the menu     cout << "2. 3GB=$45" <<
endl;   cout << "3. 6GB=$60" << endl;   cout << "Which data plan do you
have(Use 1-3)?";    dataPlan = cin.get();

    cin.ignore();

    cout << "How much extra data have you used?";   cin >> extraData;

    phoneTotal = numPhones * phoneCost;

    if (dataPlan == '1')//deciphering what the user choose in the menu  {
        dataTotal = 20;     }   else if (dataPlan == '2')   {       dataTotal = 45;
    }   else if (dataPlan == '3')   {       dataTotal = 60;     }   else    {       cout
<< "Please restart and enter a valid value.";   }   //  switch
(dataPlan)  {   case '1':dataPlan = 20;         break;  case '2':dataPlan =
45;         break;  case '3':dataPlan = 60;         break;  default:cout <<
"Please restart and enter a valid value.";      break;  }

    roundedEData = ceil(extraData);//rounding the extra data amount     if
(roundedEData == 0)     {       eDataTotal = 0;     }   else    {       roundedEData -=
1; //In order to account for the higher price in the first gig of
extra data      eDataTotal = 15 + (roundedEData * 10);  }

    billTotal = eDataTotal + dataTotal + phoneTotal;

    taxTotal = billTotal*tax;   billTotal += taxTotal;

    cout << "\n----------Cell Phone Final Bill------------\n";//Beginning
of final output     cout << fixed << setprecision(2);   cout << setw(20)
<< "Phone Charge:" << "$" << setw(10) << phoneTotal << endl;    cout <<
setw(20) << "Data Charge:" << "$" << setw(10) << dataTotal << endl;
    cout << setw(20) << "Extra Data Charge:" << "$" << setw(10) <<
eDataTotal << endl;     cout << setw(20) << "Tax:" << "$" << setw(10) <<
taxTotal << endl;   cout << setw(20) << "Total:" << "$" << setw(10) <<
billTotal << endl;

    system("pause");    return 0;


}