Telkom Poor service

Good day

Please note my contract ended on May 28th,however im still being billed for the device in my June statement.I dont understand why this would be the case as My bill was correct end of May.The worst part is I would love to speak to someone in the billing Team,but there is no option to speak to an agent.The contact Centre only directs one to the self serve options ,which I do not require help with and its totally useless.I need to get this resolved ASAP as Im not supposed to billed almost R500 + for a device that was paid up a month ago.