Exploitative price increases and failure to justify them

I recently took out a fibre contract with Afrihost which, to give them due acknowledgement, was speedily and efficiently installed. However within 2 weeks of taking out the contract I received notification that the agreed cost was going up by 12% which is totally ridiculous and blatantly exploitative in the current environment. Upon querying this with Afrihost I received a frankly feeble response that the increase was due to an increase by Metrofibre, to whom it would appear they sub-contract my business - i.e passing the buck. I have also sent a complaint to Metrofibre asking them to substantiate the increase and received no response. I will also be laying a complaint against them via Hello Peter. This a blatant ripoff from both companies.