The lady called Alida from Gem Potchefstroom very rude and unprofessional

We bought a kitchen unit in January at Gem furnishers Potchefstroom. They needed to come and assemble it. So they did come and assemble it, but they did half the job and they told us that they will come back to finish everything because they didn't have the right *****s. Until to date ( 12.03.2026), we haven't received any help from them. I have been calling almost every day. The white lady called Alida, it's very rude, very, very rude. When you call, she shouts at you. She drops a call while you are in a conversation with her. She's very unprofessional and ******. So I don't know how to deal with this matter because they are not even promising to come to address the issue at hand, yet they are debiting the installment money every month. I need someone to help me connect with the owner of Gem Furnisher Potchefstroom store or the head office please.