bad service

I took a contract for myself in April 2018, for a huawei p10 lite, R 249.00 plus you get a 30gig once off thereafter 1gig, top up contract, I did not get billed in April 2018, End of May 2018 i got billed, R 527.26 . I advised them twice in store it must be a top up. they said yes. After i got debited, I called Telkom store in Ballito to ask them why i got debited so much, the lady said pro rata, i said can not be pro rata for so much, because my contract is a top up of R 249.00, and the agent said no extra fees. I'm really frustrated with Telkom, Then I decided to call the branch again, Now I am told they put my contract as a open contract, this will only be rectified next month, For this month i need to be reimbursed, Maybe all unhappy customers should take their matters further, really frustrated....