Poor service and disgusting call etiquette

My mom wanted to call in to Old Mutual to try and change somethings on her old mutual and also to double check that her payment has reflected. We were on the line for 35 minutes before we got someone and the person that we got hold of dropped the call before we could be assisted. We called again this morning after 17-20 minute got hold of someone by the name of Tyrone who also dropped the call before we could get assisted. This is unacceptable as we are using our own airtime to call. The agents are rude and inpatient and dropping of calls is a regular thing.