This snippet of code will change your MAC Address and try to connect to a service that blocks the user's MAC Address after some minutes.

Macchanger.sh

#!/bin/bash
declare -i count=0;
while true; do
  count=count+1;
  now=$(date +"%d/%m/%y %T");
  echo "Execução de número "$count;
  echo "Iniciado em: $(tput setaf 2)"$now"$(tput sgr0)";
  echo ;
   
  nmcli d disconnect wlan0
  ifconfig wlan0 down
  macchanger -r wlan0
  ifconfig wlan0 up
  nmcli d connect wlan0
  DETECTED_MAC_ADDRESS=$(ifconfig wlan0 2>/dev/null|awk '/HWaddr/ {print $5}')
  xdg-open "http://autenticador.olalink.com.br/login?dst=&username=T-"$DETECTED_MAC_ADDRESS
   
  echo ;
  expire=$(date --date='+30 minutes' +"%d/%m/%y %T");
  echo "Expira em: $(tput setaf 5)"$expire"$(tput sgr0)";
   
  sleep 1810;
  clear;
done