Telkom dissapointment

Hey I have a contract with telkom may month I had to pay R1oo8 for both fones and June month R12oo for 1 fone and R45o for the other where as 1 fone is R370 and the other is supposed 2 be R235 I paid these amounts and on Sunday my fone got blocked they said I had to pay another R55 becaus3 I paid the wrong amount I am so fed up with telkom I no longer want contracts with them and I wouldn't advice anyone 2 open contracts ther