Poor after sales service

Order No *** Query *** : I purchased 4 bar stools online. Total amount paid R6900.00 Upon delivery only 2 chairs were able to be assembled. The other 2 chairs have different bottom parts which does not align to make assembly possible. I have logged a return and request for Makro to come and pick up the 2 chairs and exchange both upon collection. I have sent emails, I have phoned the online department every day. No one can assist me - they keep on promising to get back to me without anyone contacting me. THis is very poor after sales service. It makes me wary to order from Makro online again.