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Here is an article that will tell you how to transplant your pampas grass with the best rate of success:

http://homeguides.sfgate.com/transplant-pampas-grass-70968.html

Here is a great article with some help for you.

https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/pampas-grass-removal.htm

Burning was once considered a way to control Pampas Grass.
I would not recommend it as a preferred method.
These grasses can burn hot and get out of control fast.
Also the grass will will regrow quickly so the spread of the grass will not change.
You will want to check with your local government if you do decide to attempt burning.

https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/pampas-grass-removal.htm
https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/growing-pampas-grass.htm

Here is a link that will help you

https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/pruning-pampas-grass.htm

Ivory Feathers Dwarf Pampas Grass grows 3 to 5 feet tall and 3 to 4 feet wide.
Flowers reach 8 to 10 feet.
Most garden centers will carry ornamental grasses and many can special order plants for you.
Mail order sources can be located by doing Google searches.
Here is an article that will help you with planting and care requirements.

https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/growing-pampas-grass.htm

I would give it some more time. Warm season grasses begin to grow much later in the spring.