Forced into a changeroom with a stranger by sales assistant

I was in the Mr Price change room line, which was pretty long. I was up next to get located a change room and then suddenly the lady behind me asked to go infront of me and without hesitation i said "yes" because i was in no rush.

Then the sales assistant working at the change rooms told me to go into the change room with the lady infront of me. I said no, it's fine because the lady was a stranger and like i said before I was in no rush. But the sales assistant and the random customer insisted i go in with the stranger until they forced me to go in with her.

I thought it was strange that i was forced into a change room with a stranger by the Mr Price sales assistants. And spoke to the manager about the incident and how rude and how much of an attitude the sales assistant had, and he just asked me to point her out and said he will speak to her. But i was never reassured that such a thing will happen again and this has truly broken my trust with the brand and how unprofessional they are. imagine what could've happened in that change room i was forced into with a stranger. so dissapointed.