Good afternoon, Ivan.
Please pay attention to the cost of the invoice that was paid. You paid 1819 rubles, and the cost of tariff 3 on the site is 5496 rubles /ru/prices/#cloud_onebox
Now let me explain why:
Previously, you rented 1 license (up to 1 simultaneous session) at a cost of 1819 rubles/month. We have had changes in the composition of the acquisition of cloud tariffs (we notified all users by mailings + this information was also in the news of the site) and as such there are no more "licenses". Now there are only tariffs 3,5,10, etc. For this reason, the invoice indicated "tariff 3 (up to 3 users)", but in fact this is the same license that you used earlier, without any restrictions (there is an API, the ability to work with suppliers, integration with online stores, etc. ).
How I see the solution to this situation:
1) You work under the same conditions and have the opportunity to 1st simultaneous session in OneBox.
2) You pay the difference up to "tariff 3" and we transfer you to the tariff for up to 3 simultaneous sessions. But carefully before that, read all the conditions here
https://crm-onebox.com/ru/prices/