If you receive a call from 6746662248 or similar it is likely to be a scam. Do not respond. Contact your supplier and think about blocking this number.
You can also contact 03450700707 for further information and probable action to take.
I was lucky and my sim supplier has credited me with the charges levied.
Thanks - there are so many scams about.
You can add 257 7811 1684 to your lists
Country of Origin supposedly Burundi.
I suggest you don't answer or reply and inform your SIM Provider and have the number blocked.