Exploitative price increase and failure to justify it

I recently took out a fibre contract with Afrihost which 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 then sent a complaint to Metrofibre asking them to substantiate the increase and received no response.This a blatant ripoff from both companies.