Bad customer care

First of all I would like to say that the first time I received a call to sign up for fibre an associate told me I could get fibre with a voucher which allows me to manage payments on my end which sounded great to begin with. Once I signed up for this easy pay voucher deal with vumatel I have not received a easy pay number and for 3 months I had to make a psychical payment into their account which took about 3-5 to have my internet up and running as they had to receive the payment and wait for the process to be done. Which cost me so much airtime everytime I had to call in because my internet would not be up and running. I then phoned in to have a debit order done on my account so that I can have internet throughout the month going into the next month without any stops. I was then told I needed to cancel my whole deal to have this done and then months later only received a easy pay number. Now I am sitting with technical issues and a slow speed and whenever I call into customer care I’m spending about R200 airtime just to get through to them and then I am unable to resolve the issue. I have messaged them on WhatsApp, Facebook as well as Instagram and the moment someone gets in touch with me they say they will get back and I do not get issues resolved. I am also waiting on a refund since October and they have escalated the issue to management but it seems like management is also really bad at getting back to me. They have the worst customer care ever !!! I am so frustrated because I depend on internet connection for work and I cannot cancel with them otherwise I will be sitting without a line for more than a week to have something new installed.