I have ordered an Alternator 21 days ago and I have them R2000

I have ordered an Alternator 21 days ago and I have them R2000.00. 7 days later they informed me that they don’t get the part. They promised to pay me back my money within 3 days. The Salesman by the name of Keagan, said everything depends on his Boss. I need any help to get my money back. They are taking me from pillar to post now