Vodacom internet

I have a data wi-fi contract with vodacom, my 20 Gig (10 day, 10 night). Internet during the day is no existent. Only works between 11pm and 7am. Numerous times during 2020 call vodacom about the problem. They escalated to the technicians, that suppose to call me. Never happened , they send me SMS telling me, that the case as been cloused, without a word to me. The signal between the tower and the wi-fi is good (42 dBm) but is no internet in the connection. I'm thinking in canceling my contract.