NETSTAR BAD SERVICE

I HAD MY TRACKING DEVICE FITTED A YEAR AGO AND EVERYTHING WAS FINE. MY CAR HAD TO GO TO THE WORKSHOP TO HAVE THE ENGINE REDONE SO IT STOOD THERE FOR 4 MONTHS I ONLY GOT IT BACK ON MONDAY 23 DECEMBER 2019 AND DIDNT PICK UP MY CAR ON MY TRACKING APP ON MY PHONE I SENT NETSTAR A MESSAGE TO PLEASE FIX IT THEY THEN CALLED ME AND SAID THAT THE UNIT IS FAULTY AND THAT THEY NOT PICKING IT UP EITHER, I GAVE THEM ALL THE DETAILS AS MY BROTHER FINANCED THE CAR FOR ME BUT THEY SAID THEY CANT PICK IT UP ON HIS NAME OR ON MY NAME. I HAVE PAID CASH FOR THE UNIT AND FOR THE NEXT 3 YEARS NOW THEY WANT TO CHARGE ME TO COME AND FIX THE UNIT. SO BECAUSE IT HASNT BEEN WORKING IF MY CAR WAS TO BE ****** THEN HOW WOULD THEY SEE WHERE IT WAS? HEAVEN FORBID IF I WAS IN THE CAR OR ONE OF MY CHILDREN WHEN IT GETS TAKEN, THEY WOULD NEVER FIND US. NETSTAR IS NOT DOING WHAT THEY SAY THEY WILL DO IS KEEP YOU "SAFE AND SOUND" PLEASE CAN SOMETHING BE DONE ABOUT THIS AS I WONT FEEL SAFE UNTIL THE TRACKING DEVICE IS SORTED OUT THANKING YOU JOLENE