What’s the difference between subscription plans?

Question

When I was looking at the subscription options in my iPhone settings, it came up with the following monthly plans:
£6.49
£6.99
£8.99
£12.99

What’s the difference, it has no information written there?

Answer 1

but that's not the case on iPhone, when I go to subscribe it has 10 options with different prices and it does not explain what the difference is.

https://imgur.com/a/cgfx25B

Answer 2

There are only two plans available one is of 12 months which costs 119.9₹ per months and other is a single month plan which cost 169.9₹

Answer 3

That's strange.
Sorry, but I don't use a iPhone.
You can contact to SoloLearn at [e-mail] for more details about plans.
(Don't forget to attach this screenshot in your mail)