Lack of support to fix an issue made on merchant side

I have been using MTN MoMo for several years and have generally been able to resolve any issues on my own. However, I recently encountered a problem with a deposit that was reversed by MTN but not credited to either my bank or MoMo account. Trying to obtain assistance has been nearly impossible. All support numbers direct me to an automated service that offers no useful options. The WhatsApp line lacks the features necessary to provide help, and speaking to a representative has proven virtually impossible. Over the past two weeks, I have tried every available support channel and received no assistance.