Bad services call centre billing

I have an account with Telkom - as from March 2020 I never received any account invoices. We were also very limited times at the office. Then I tried phoning for my amount due - you just hold on. Today a guy from Telkom phoned me R1156 account - I asked please send me the invoice its impossible we are almost never at the office due to covid. I also requested all invoices from March 2020 I never receive any invoices. He said he will send - he did not send. I am fedup with telkom