No service and nothing being done

Logged a technical problem on the 1/8/18 that we can not use the data on my cell phone the connection is very slow. Alto came out on the 16-8-18 and did tests they agreed that the service was slow. Contact the TALK To Us line nearly every 2 weeks to find out what has happened. The only answer I get is that it is with technical. How long is it going to take to correct the problem over 5 months now.