Guess who sent all those SMS. The network providers themselves -- MTN and Glo. And I think I have deleted some of the SMS and they are still that high.
I was very glad when last week, I read that NCC has enforced the do-not-disturb short code 2442.
To make the network providers stop sending you unsolicited SMS, just SMS STOP to 2442.
I did that and I think it's working. No more "get daily love tips", "your number has been selected to win N1 million", "get weekly finance tips", "delight your callers with Terry G's new song as your ringback tune", Akpos don come again o! Catch the chronicles of Akpos", "You have unclaimed offers, you have been awarded Quotes/Proverb and free surprise gift for N100/week" and other shamelessly spammy SMS.
Have you enabled the DND on your lines?