VOX telecom Bad *********** service

After 4 weeks of constant following up at my expense to get Vox to rectify slow down load speeds of about 20 % of what i was paying for and communicating with a number of their technical people over the period to try to rectify the problem which ended being a setting on the Vox system on Vox's side ,determined when i eventually get hold of some one who knows what he is doing, taking 5 min to rectify ??? . The customer care manager , tells me they app**** "best effort" and expect me to pay for the full service which i did not get ??? is this right , acceptable ??? This shows utmost arrogance and incompetence by VOX and is only rewarded by moving on to other better and more competent service provider that are prepared to acknowledged they are in the wrong and were incapable of rectifying the problem timeously to not inconvenience the paying customer and provide good value service for their client. This problem had nothing to do with the broken undersea cable which was offered up as an excuses at some point to further show their arrogance / incompetence .