Snail Download Speed

Good Day

I am a loyal customer for years now of vodacom mobile and for the last few years of fiber. Lately I am experiencing very low download speeds at night from 18:00 till late. I am on a 20 download 10 upload, after a year or so vodacom did send me a mail saying thank you for being a loyal customer and for being a loyal customer they will automatically increase my fiber line speed at no additional charge. So after that my download speed was at about 40 mbs and upload almost the same. As said the last 2 weeks I called in a few times regarding very low download speeds from 18:00 low as 2mbs and also loaded a service request SR*** that was loaded 21/03/2022 and status is now pending. I had 2 calls from a technician asking me if the line speed is better now because they made a few changes and I told them that it is still very low during that times. Yesterday I also had a call from the same number *** and said that I will test it last night and the test results is 5 mbs download and 36 mbs upload which is unacceptable. Well this issue is going on for so long that I am currently busy looking for another ISP because I can no longer work with this slow internet speeds. I also referred a few family and friends to vodacom and also 2 businesses and will also advise them to change ISP. Vodacom is fast to send out 20 mails regarding prices going up but they forget to send out the mails saying that the level of after sales is going backwards.

Thank you in advance