How to reach sms.ru support service?

Question

SMS

The people who work with sms.ru or who work in sms.ru, who know how to reach them, a month has already passed since my first appeal, but my questions are not processed, I also supplemented my question several times, but the question is also remains unattended.
Tried to call them but they say the phone number is out of service.
However, sms are sent and everything works according to the standard, but their callback system does not work, which I need to implement billing so as not to make people wait for 20 seconds when they perform some actions that SMS notifications are connected to.
Or tell me an alternative with the same prices as sms.ru, but with a working callback function, otherwise it will not be correct to deduct money from the client's balance for undelivered SMS.

Answer 1

I recommend space sms . I have not seen better prices anywhere. And they are delivered very quickly. Everything is documented in detail, api is normal.