Don't Trust Day Nigh Electrians!

We had power issues to our home 2 weeks ago. Our usual electrician was not available so we looked online and called Day Night Electrical. The issue was the earth leakage. We were quoted R5895 for the part. Being none the wiser and at 22:30 at night we agreed. The final account including call out fee etc. was R7485. We paid part in cash and part EFT before the electrician even left the house. We were so disappointed to learn that an earth leakage part costs R1500 retail at Builders and R750 for an electrian. I have no issue paying for labour after hours, call-out fees etc. but to be so ridiculously ********** on a part makes me furious! Reading the other reviews I realise that this company has no business ethics.