Vodacom accused me o...

Vodacom accused me of not paying my rooter in January I sent them my proof of payment and they disconnected my rooter in April I asked them why they said I didn't pay for February I sent them again proof of payment now they charging me for the rooter that was disconnect in April they say I owe R1300 and they say I was making cash payment but I informed they on March and the lady assisted me to be changed to cash payment now they say , that lady who assisted me was fooling me