Refactor sending to multipe receiver

[axel]

Hi Axel,
Thanks for your response earlier. I find that the error has returned again
- Database query failed. I think it occurs more when more than one number
is the recepient, like in a group.

If one of them fails, it says 'database query failed', and it does not
deduct the sent message tally from the total credits of the user.
For example:

I send a message to 5 numbers. The first two go successfully, but the 3rd
fails. Instead of continuing with the number 4, it says 'Database query
failed' and stops. It also does not remove two credits for the sent
message.

[axel]

After sending a sms, now modify balance first, than archive the sms.

If something went wrong during store send sms to dababase, the balance was not modified.