Spar school shoe promotion poor quality.

I bought the promotional school shoes about 2 wèeks ago. Yesterday the sole completely seperated from the shoe upper. This is very poor qaulity. Went back to the Burt drive Spar to enquire about a gaurantee. They told me there is no guarantee and that i should email head office. How is this. I still paid R75 and spent over the R350 to obtain the shoes. Yet there is no gaurantee? Dont sell ******* as a promotional gimmick to boost sales and then excuse yourself from accountability.