Cancelled account being charged

Once Again - I have to complain about Vodacom. First they sell me a contract when there is no Vodacom coverage in my area. 2nd They agree and cancel the contract with (they say no further costs). This was at the end of March, 2025. Today I receive an invoice charging me for :- "Reduced Subscription Discount Proration-New" I try to contact and get a BOT that doesn't understand my question. Then I try another answer that simply has a machine informing me that they do not deal with pre-paid accounts and cuts the call. Mine is not a pre-paid account - it should be a non-existent account and the number when typed in (on their request) should immediately show that this account no longer exists. I am furious as once again Vodacom is simply being *********** and costing me a great deal of frustration and no doubt money