I have a contract with Iberbanda for my Internet access. The contract is for 1Mbps download speed. I live in the campo and cannot get an ADSL landline to my house.

Two months ago my Internet speed dropped to an average of .48 of the 1Mbps, less than half. Sometime the speed drops to .25, a quarter of my contract with Iberbanda.
I have contacted them and I get brushed off with a statment that says they 'Legallyl' only have to provide me with 10% of the contract speed, in real terms that is 0.10 Kbps of 1Mbps.

Iberbanda have not been helpful with this and I find this unacceptable

I wondered if anyone out there can help with the legal side of this AND is there some official office that I can complain to.