How Should We Handle a Double GST Payment Issue with a Proprietor? Seeking Advice on Legal Notice Steps

We have paid a GST amount to a proprietor along with the entire product value. However, since the proprietor did not raise the GST amount, we have received a notice from the government. Although we paid the GST amount to the government, we have now had to pay twice for the same bill. We want to send a legal notice to the proprietor for the recovery of the money.

Follow up with the proprietor and ask them to pay the GST amount. Some vendors take time to make the GST payment. Keep a legal notice as a last resort.