808 Call centre not responding

Good day, <br> I have been trying to contact your Contract call center (808) for the past 5 days but to no avail, I urgently need to blacklist as my phone was ******. I have been calling your call center about 10 times per day for the past five days, I hang on the line to be transferred to a consultant but the call gets cut off. Since your call center is of no service, I then went to an MTN store