Neotel poor service

Been a customer over a year 6 weeks ago our speeds drop to under 1MB. After complaining they change the router couple of days the re-tuned the external Ariel. all seemed OK for a week and now its very slow again. we reported the fault N***5 this Friday. still no feedback and now its Sunday. I am a bushiness user on the top tier Package 10MB but speeds are under 1mb. this is costing me over R3000.00 per month and I FEEL THAT Should be refunded because I PAY AND DON'T GET THE ADVERTISED SPEEDS.Service used to be great now it seems they are not interested in solving the issues just collecting the money, I would have recommend it to anyone now I feel the service levels have dropped I could not anymore. So Neotel please refund me for lack of service delivery I am not prepaid to pay for 1 or 2 MB for over three thousands Rand a month for this. I shall cancel on Monday and even if still in Contract-t-Neotel are not delivering on there side of the deal.