Is there anyway that I can use Kirby without 7.1 PHP?
Kirby 3 definitely requires PHP 7.1.0+, so no.
Kirby 2 can be used with PHP 5.6+.
I’d recommend changing the hosting provider. PHP 7.0 has reached end of life: http://php.net/supported-versions.php. A hosting provider that uses unsupported PHP versions is definitely not worth the money.
Yes - move hosts. The fact they won’t upgrade rings alarm bells.
Search the forum - somewhere theres a list on here of community recommended hosts. For whats its worth, I like Krystal Hosting and Fortrabbit, but i’m in the UK.
As already mentioned, this is a big no-go! You can compare it to a car repair shop that does not want to renew the brakes of your car, even if necessary.
they are happily renewing them, even if it’s not necessary
Change your garage, not your hosting.