Reading data received from Nextion on Serial Monitor

Other Hardware Displays
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Hello Can anyone help please.
Got a far as trying to use Serial Software but using "Serial " I get the expected results but using the "mySerial code "I seem to receive nothing at the Arduino.
This works using Arduino Pins 0 and1

int aaa = 0;
int bbb = 0;

void setup() {
  Serial.begin(9600);
  Serial.println ("   GIDDAY  ");
}

void loop() {
  
if(Serial.available())
{
String datA="";
delay(30);
while(Serial.available()){
  datA+=char(Serial.read());
  }
  //Serial.println(datA);
  //sendData(datA);//   
  aaa = datA.toInt();
  if (aaa >0){
  Serial.println(aaa);
  bbb=(aaa*12);
  Serial.println (bbb);
  }
}
}

This receives nothing at the Arduino using pins 14 and 15

int aaa = 0;
int bbb = 0;
#include <SoftwareSerial.h>
SoftwareSerial mySerial(15,14); //RX, TX 
void setup() {
  mySerial.begin(9600);
  Serial.begin(9600);
  Serial.println ("   GIDDAY  ");
}

void loop() {
  
if(mySerial.available())
{
String datA="";
delay(30);
while(mySerial.available()){
  datA+=char(mySerial.read());
  }
  //Serial.println(datA);
  //sendData(datA);//   
  aaa = datA.toInt();
  if (aaa >0){
  Serial.println(aaa);
  bbb=(aaa*12);
  Serial.println (bbb);
  }
}
}

Can anyone please give me some advice
Tx

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