MTN Cape Gate - No Guarantee on SAMSUNG Powerbank freebies

My wife did an upgrade ont 1st of May 2019 at MTN Cape Gate. When doing this upgrade, she was given the new handset and a Samsung Power bank to sugar coat this deal. So signed and sealed the deal we went home. Used the phone all good, no problem On Saturday 8 June we used this Powerbank and it ran out of power, so we charged this Samsung Power Bank...only to find out the powerbank does not take charge. we tried several times over the weekend without any success. So on Monday she calls this MTN shop at Cape Gate to see what the options are...only to find out that "there is no guarantee on freebies" How can you not have any guarantee option on a Brand name like SAMSUNG, but the people who sells these contracts make sure you know you get THIS AND THAT AND THIS with your new phone to the value of whatever amount of rands...which infact does noet mean anything if you run into trouble. I phoned this outlet to get the owners number, needless to say this person does not answer any calls or it is a phony number. Be weary of acts like this as people are only in business these days to take money and dont care about anything like guarantee or even customer service for that matter.