Poor service delivery😠

I bought a duvet set on the 24th of March. I found the samething cheaper somewhere else and i took it back for a refund on the 28th of March of which i was promised a refund within 4 days, it's now 12 days my money is not back yet, called the store on the 7th i was promised a follow up but my details were not taken down. Called again today was told the manager went out and he/she will call me back, i never received a call from the manager, my money is still with them. Its now 12 days still no REFUND So DISSAPOINTED.