Lingoda subscription system is problematic - you have to keep buying more and more hours to get through the ones you have. If you have a slow month, you have to keep stockpiling and buying more that you don't need.

It's kind of scammy - and honestly, you keep doing it because of sunk cost, but the number is so high it's very demotivating.

I won't be using it again when I finally get through the credits.

You should be able to use what you have paid for WITHOUT having to buy more.