excessive charges on data billing account

I have queried about excessive charges on my data billing. I have not heard anything from MTN on the progress of my query in three weeks. I was told it will take 7-14 days for the data department to trace the data usage. I have still not heard from the data department or atleast received my statement and of course my account this month will be debited for the excessive amount. Not like I can call their call centres for any help. As they are CLOSED. I am extremely disappointed by the customer service of MTN!. Never again will I enter into a contract with MTN. Should any personnel from MTN take the time to respond to this, the ref numbers are *** and ***