If it happens 1 time, we can consider it mistake, if it happens 2nd time, we can say bad luck, but if it keeps happening 3-4-5 times on same number, how can we say its system error? It might be some scam from operator's side to get money from customers on basis of useless VAS which customer is not interested or will never use.
I don't think population is issue, because a robust backend can very well handle huge number of traffic, and I can say this because I have seen mechanism of backend for US operators who handles millions of data generated in minutes without any errors.
I don't think population is issue, because a robust backend can very well handle huge number of traffic, and I can say this because I have seen mechanism of backend for US operators who handles millions of data generated in minutes without any errors.