Northside Electrical Lighting charges 30% handling fees on returns

I bought 12 light bulbs. Someone gave me light bulbs later that day, so I took the lightbulbs back. They charged a 30% handling fee off my refund! I asked to speak the the main branch manager as I felt this company policy is very unfair. They said he'd phone me the next day. 3 months later, I'm still waiting.