Extremely slow 3G internet

About 4 years back we had a 10GB Telkom Mobile data contract, and enjoyed fast 6mbps download speeds.<br> We took out a Mobile 24-month contract that include 500mb data.<br> The BIG problem is, during peak times at night my download speeds are 0.14mbps.<br> Telkom, this is very slow and completely unusable. Not even the smallest web pages open. <br> I canceled my MTN contract after 16 long years, trusting you to provide a better service.<br> We trust you will be able to fix the problem asap.<br> Hope to hear from you soon :)