Standard Bank disgrace

I went to Malawi for 2 months. Each month I should had to make a payment of 1800.00..wich I couldn't cause Cell C was not roaming where I was. 50 km south of Blantyre. So I got one local Sim card from TNM. Now I got a new number, voice and data. Demands for payment starting now from Standard Bank and I replying that cause I was not using my SA number I couldn't get access my otp and make the payment. I even said " latest 6 weeks I will make all payments". Guess what? I arrive in SA made immediately the payments AND THEN STANDARD BANK PUT ME IN ITC. AFTER BEING WITH STANDARD BANK FOR 30 YEARS WITH A 100% CLEAN RECORD. WHO ALLOW THIS TO HAPPEN? I'M SURE MANAGEMENT SHOULD BE AWARE OF THIS TYPE OF UNFORTUNATE INCIDENT. ALL QUERIES I MADE AFTER END UP IN" YOU GUILTY NOW SUFFER" WHAT A SHAME. A LADY FROM CUSTOMER SERVICES EVEN TOLD ME AT LEAST 2 YEARS BLACK LISTED. I THINK HER IQ = DEAD CAT. BUT WHAT TO EXPECT FROM UNS****ED, UNPLEASANT, UNPROFESSIONAL ATTENDANTS? HIGHER MANAGEMENT SHOULD STEP IN!! PEDRO PRATA ID. *** CELL. ***