YOCO SERVICE SUCKS!

WORST SERVICE EVER! MY BUSINESS HAS BEEN A LONG STANDING CUSTOMER WITH YOCO. I HAD AN ISSUE WITH A UNIT A WHILE AGO AND YOCO REPLACED THE UNIT AS IT WAS FAULTY. WHICH ANY BUSINESS WOULD EXPECT IF A UNIT ISNT IN WORKING ORDER. NOW I AM BATTLING WITH THE “REPLACEMENT UNIT” SOME TIME HAS PASSED OBVIOUSLY. I REQUESTED THAT I CAN MAYBE UPGRADE TO A DIFFERENT UNIT AND WILLING TO PAY IN. NOW YOCO SAYS I CANNOT UPGRADE AS I RECEIVED A FREE UNIT FROM THEM? YOUR UNIT WASNT WORKING? HOW IS THIS A FREE UNIT? I HAVE BEEN A CUSTOMER FOR YEARS? HOW IS THIS SERVICE TO DENY ME AN UPGRADE! I AM WILLING TO PAY IN THE DIFFERENCE? NOT EXPECTING IT FOR FREE!!!!!!!!! THIS IS TOTALLY UNACCEPTABLE AS THE UNIT I HAVE IS UNRELIABLE AND UNRESPONSIVE MOST OF THE TIME I NEED TO USE IT.