Bad service

I recently migrated my fibre line speed to 50/25mbps. The line speed is slow. I contacted the Vodacom fibre call centre to migrate my service to 200/200mbps. I was advised only one migration can be done per month. I am now stuck on a slower speed and a service I do not wish. Upon requesting a cancellation I was advised that I will be bill for two months for the service i do not wish. I’ve dealt with 4 representatives from the Vodacom fibre contact centre who did help me and proceeded to put the phone down or transfer me back into the call queue. SR***. The experience was very frustrating and time consuming. I am still stuck on a slower speed for service I do not want. Please assist with upgrading my line speed to 200/200mbps.