High ping/packet loss

I have a 2mb ADSL line with telkom with MWEB as my service provider, as of the last 3 months i have had almost no improvement and/or feedback about my complaints about high ping (ranging from 75-120 on local servers that i normally get 30 ping at) and packet loss ranging from 1% up 15-20%. All these problems happen on day-to-day bases ranging from 12 pm till 1:30 or and sometime the hole day while other days the line functions normally from 10 am to 5 pm. I have made a complaint with telkom a few day after the start of the problem but after they claimed the problem was fixed the line was fine for 1 day, i have made a another complaint 1 month ago with minimal success, i have used (with help from telkom/mweb) a telkom guest account (mweb help) and one a telkom test account with no improvement (as added insurance i have tried other internet account with afrihost and access same problem)