Volume dial decreases volume if turned either way

There is a large, round twist button on the LEFT side of the display screen. Twist this to adjust the volume, usually Clockwise for louder and Counter clockwise for quieter.
Try this web link for the user manual.
https://www.sony.com/electronics/support/res/manuals/4542/45423032M.pdf

Run your finger clockwise around the circle that has "Menu", "Fast Forward", "Rewind", and "Pause". Clockwise increases the volume and counter clockwise decreases the volume.

You declined to specify the make and model of your player, so I'm assuming it has a control dial on the front. "Turn" the dial clockwise to increase or counterclockwise to decrease the volume.
If your player doesn't have a control dial on the front, please reply to this post and specify the make and model of your player.

You didn't specify the make and model of your player, so I'm assuming it has a control dial on the front. "Turn" the dial clockwise to increase or counterclockwise to decrease the volume.
If your player doesn't have a control dial, please reply to this post and specify the make and model of your player.

on the bottom right hand corner of your phone, rotate the dial clockwise to increase volume, or counter clockwise to decrease(must be done DURING a call)

Counter clockwise 3 full turns then clockwise to the first number.

Turn the dial while it's playing. Clockwise to increase, counterclockwise to decrease the volume.

To turn the beep off (or volume down) on the Exxcel 7 (BOSCH WAE24468GB you do the following:
1. Turn setting dial to off. 2. Turn dial one step clockwise (wait for panel to light) 3. Keep finger on 'RPM' button and turn dial another step clockwise and release finger. 4. The default setting of '2' should appear on the display, this represents the Button Signal Volume 5. Pressing 'Ready in' button cycles through the volume settings from 0 (off) to 4 (very loud!). 6. Turn dial another step clockwise to set the 'Information Signal Volume', which is also set to '2' by default. This is the one that annoys everyone at the end of the cycle!
All the manuals are on the Bosch website, if you know the model code.

dont know how to program the remote, but u can adjust the volume manually by using the dial. similar to an ipod if you move your finger clockwise around the dial the volume will increase, and counter clockwise will decrease

This type of volume control is often called an encoder. Basically it is a control for an electronic volume control chip. Rather than a vairable resistor like the "old fashioned" volume controls, this one basically is a rotary on/off switch. As you turn it the internal fingers pass over copper bars causing quick on/off sequences. These are interpreted as vol up and vol down.

Realise that this is an over simplification, but is essentially how it works. Your unit is fine.

Dan