Rain internet service choke their clients

As clients of Rain Internet service, we pay for 30 to 60 Mbps download speeds. These are the specs that Rain advertises to get new clients. As seen on Facebook, Rain doesn't constantly provide this speed. At times we reach 60mbps but at times, especially during evenings and week-ends, they choke the clients. Again we have been dropping below 2mbps for several days. Their client service also adds no value. They would phone the client and have a lengthy discussion about your position, blah, blah, blah and nothing would change.