Moving to area that use different amount of volt then USA. I called customer service of device I owned & they didn't recommend voltconverter?

Just because they didn't recommend it doesn't mean you can't use them. If they recommend them, they could be liable if anything goes wrong. They don't make the voltage converters and have no control over their quality so they can't really recommend them.

Many modern power supplies/chargers will work with any input voltage, and that works fine for low powered devices like phones or laptops. When it comes to mains powered equipment, you need a converter that can deliver the voltage and current required. They can be bought from reputable electrical or electronics stores.

If you just need chargers for modern electronic devices, they are very inexpensive to buy and readily available. If you buy them in the country you are going to, they will have the right plug fitting for that country and will be made for the right voltage.

If the chargers are made for 50 to 60 Hz, use a step-down transformer

rated for at least twice as much power as will be drawn from it

(i.e., if the total load is 87 watts, use a 200 watt transformer).

[If the chargers are for 60 Hz Only, don't try to use them there at all.]

You might need to get 220-volt or "universal voltage" chargers ---

IF they are available for your items..

They don't want to be responsible for an unknown voltage converter. What devices are we talking about?

Laptop AC power adapters are usually "world": read the sticker. Chances are that all you will need is a new "mains" cord. (it plugs in to the power "brick".)