The phone comes with a 6.50-inch touchscreen display offering a resolution of 720x1600 pixels at a pixel density of 269 pixels per inch (ppi) and an aspect ratio of 20:9. Oppo A53 2020 is powered by a 1.8GHz octa-core Qualcomm Snapdragon 460 processor. It comes with 4GB of RAM.
Check whether the alert slider is in the "Ring" mode and adjust volume to a high level; Make sure the speaker hole is clean, not blocked by foreign matters; Restart the phone to check if the issue persists.
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