Telkom fibre 4 mbps nightmare

seven months into my 4mbps uncapped fibre contract I have had endless problems. In short two months after joining telkom advised their minimum speeds have upped to 10 mbps and all existing 4mbps has automatically been ‘upgraded at an extra cost of R44 pm. Here the nightmare started. They never upped the speed but charged for it. Eventually uped it to 10 mbps ‘lite’ which is less data, and upped the price to 850 , completely ignoring the contract I entered into. Numerous calls to callcentre resolved nothing as well as many visits to the walk in store.can you please help as at wits end as to how solve this, are there anyone out there experiencing the same nightmare.