MTN CONTRACT.... But I Must Deal with.. .MONDO.. Who the heck is MONDO

Hi... Updated on MTN online 14/03. PROMISED 20GB anytime data was not ativated. Called MTN to query and was told that because I upgraded online,.they cannot help me. I must contact Mondo...I don't have a contract with Mondo... I upgraded online with MTN. My contract is with MTN. I have contacted Mondo(whoever they are) and, guess what.... Still no data 😭