Standard UK visitor visa time

On March 19, 2019, I applied for a standard British visiting visa. My biometric data was taken on the same date. To date, the visa has not arrived yet. It has been more than 15 working days and I have not received any updates by e-mail.

Today, I called UKVI and asked them about the status of my application. They said that the visa had already been decided on April 2, 2019. Since I still have not received my visa (today, April 11, 2019), what are my options?