30 minutes for my call to be awnsered

Last month a query was logged on our company account removing one of the bill limits. This month even after sending a letter, the bill limit was still enforced. I waited 31 minutes on the line, just waiting for my call to be awnsered. Surely this is a business account and you employ enough staff to manage the call centre timeously. Not sure how many businesses can spare their staff for 30 minutes while they wait for MTN to handle a query. honestly ridiculous! Nevertheless the query was handled timeously once I managed to get through.