Leaves a bad taste in my mouth

I choose a package offered by Rocketnet/sadv. Its gladly accepted my debit order, I recieve my lime speed, im happy. Until my line speed gets changed (dropped) with no communication to me the customer and with no adjustment to the price. I'm a very reasonable person until I feel I've been mistreated as a customer or done in. In this case I've been done in and mistreated as my problem falls on deaf ears, my tickets are closed without the problem solved. They just expect me to keep quite, pay the same price for less speed. Not acceptable. All I'm telling them to do is correct it, make it the same as was agreed on email. And all will be just fine again. Really not difficult. I've never taken my gti to volkswagen for a service and upon collecting it I now own a citi golf but still pay for a gti. Very bad way rocketnet and sadv have handled me as a customer. Just bad. As a trustee at my complex I will started looking for a new company to provide fibre for the entire complex. And adjacent complex's to.