Customer Number *** - Appalling Service from Hisense

I purchased a dishwasher from Hisense and after only having it for a week, it started giving me an error code F54. Hisense sent out a technician, who established the drainage pump is broken and that I would need to get a new dishwasher. I called Hisense everyday for 3 days and everyday I was promised that the credit would be issued by COB that day. Today I finally get the credit note, however Makro are not aware that a new one needs to be delivered and the old one collected. I receive an email from Makro advising I must take the credit note to the store. How is this customer service, surely the consultant at Hisense should contact the store and arrange this. What makes it even more difficult is that Makro National contact centre do not answer your calls and I called Hisense again, only to be left on hold. HOW do I get my replacement dishwasher?????