Cannot use internet in Mossel Bay!!

From about 7 to 11 PM at night my Internet connection becomes completely useless. I have a Mweb and Telkom account and both are unusable. I have incredible lag spikes. We've tried calling to fix the problem but nothing seems to be helping. We have received a sms that the Internet problem has been fixed in the area but my Internet is still completely useless at night. Please just tell me what is going on, if they are indeed working on the cables please inform me and also how long is this maintenance going to take? I work during the day so I cannot use the Internet which I am paying for at night.