Provided Raspberry Pi 4 with 1GB RAM instead of the required 8GB, so they are not accepting it.

I Purchased a Raspberry Pi 4 with 8GB RAM from Anshul Enterprises (Shop No. 525, Old Lajpat Rai Market, Opp. BSES Office, Delhi - 110006). Instead, they delivered a Raspberry Pi 4 with only 1GB RAM, which does not match what I had purchased and paid for. Since the product did not meet the required specification, I am not accepting this. This appears to be a case of cheating, as I was provided a lower configuration item than what was agreed upon. I request that Anshul Enterprises take back the wrongly supplied 1GB RAM unit and either replace it with the correct 8GB RAM Raspberry Pi 4 as originally ordered, or issue a full refund for the amount paid.